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<input type="hidden" name="email-subject-hash" value="f92c566cc4a2fd5595a4fa2d2778b994d8ac826e726dda1eb636ce1f7b41802b"/>
</div>
<div class="action-panel-control-wrap">
<label for="email-to" class="action-panel-label required-field-asterisk">
To:
</label>
<input type="email" aria-label="Recipient Email Address" placeholder="email@example.com" id="email-to" class="email-to" pattern="^[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\.[a-zA-Z0-9-.]+$" maxlength="100" required>
</div>
<div class="action-panel-control-wrap">
<label for="email-from" class="action-panel-label">
From:
</label>
<input type="email" aria-label="Sender Email Address" placeholder="email@example.com" id="email-from" class="email-from" pattern="^[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\.[a-zA-Z0-9-.]+$" maxlength="256">
</div>
<div class="action-panel-control-wrap">
<label for="email-citation-format" class="action-panel-label">
Format:
</label>
<select id="email-citation-format" name="citation-format" class="action-panel-selector email-citation-format">
<option selected="selected" value="summary">Summary</option>
<option value="summary-text">Summary (text)</option>
<option value="abstract">Abstract</option>
<option value="abstract-text">Abstract (text)</option>
</select>
</div>
<div class="include-supplemental-container">
<input type="checkbox" aria-label="Include MeSH and other data" name="include-supplemental" id="email-include-supplemental" class="email-include-supplemental">
<label for="email-include-supplemental" class="email-include-supplemental-label">MeSH and other data</label>
</div>
<div class="form-field recaptcha ">
<div class="g-recaptcha" id="id-recaptcha" data-sitekey="6LfsWHMdAAAAAClKbtOpjQ2pMjgsGxvv7NdZW9uI"></div>
</div>
<div id="captcha-error-message" class="usa-input-error-message captcha-validation-message" role="alert"></div>
<div class="action-panel-actions">
<button class="action-panel-submit"
type="submit"
data-loading-label="Sending..."
data-ga-category="save_share"
data-ga-action="email"
data-ga-label="send">
Send email
</button>
<button class="action-panel-cancel"
aria-label="Close 'Email citations' panel"
ref="linksrc=close_email_panel"
aria-controls="email-action-panel"
aria-expanded="false"
data-ga-category="save_share"
data-ga-action="email"
data-ga-label="cancel">
Cancel
</button>
</div>
<input type="hidden" name="email-search-details" value="" />
<input type="hidden" name="email-search-details-hash" value="0e42663a6c3bd85498fcb88798998fed7bfdc45d457db35281e41afe13cc0524" />
</form>
</div>
</div>
<div id="collections-action-panel"
class="collections-action-panel action-panel in-progress-dots-panel"
aria-hidden="true"
data-collections-open-panel-enabled="false"
data-collections-open-panel-url-hash="#open-collections-panel">
<div class="inner-wrap">
<h3 class="action-panel-heading">
Add to Collections
</h3>
<form id="collections-action-panel-form"
class="collections-action-panel-form action-panel-content action-form action-panel-smaller-selectors"
data-existing-collections-url="/list-existing-collections/"
data-add-to-existing-collection-url="/add-to-existing-collection/"
data-create-and-add-to-new-collection-url="/create-and-add-to-new-collection/"
data-get-article-ids-by-search-url="/get-article-ids-by-search/"
data-myncbi-max-collection-name-length="100"
data-add-to-collection-max-amount="1000"
data-collections-root-url="https://www.ncbi.nlm.nih.gov/myncbi/collections/">
<input type="hidden" name="csrfmiddlewaretoken" value="VX6obxuL6wXteBoxAT8ntclVJBz5h3xYcKQtOnX7G7KX82undcLpXkRzhFhhaE5i">
<div class="choice-group" role="radiogroup">
<ul class="radio-group-items">
<li>
<input type="radio"
id="collections-action-panel-new"
class="collections-new"
name="collections"
value="new"
data-ga-category="save_share"
data-ga-action="collections"
data-ga-label="collections_radio_new">
<label for="collections-action-panel-new">Create a new collection</label>
</li>
<li>
<input type="radio"
id="collections-action-panel-existing"
class="collections-existing"
name="collections"
value="existing"
checked="true"
data-ga-category="save_share"
data-ga-action="collections"
data-ga-label="collections_radio_existing">
<label for="collections-action-panel-existing">Add to an existing collection</label>
</li>
</ul>
</div>
<div class="controls-wrapper">
<div class="action-panel-control-wrap new-collections-controls">
<label for="collections-action-panel-add-to-new" class="action-panel-label required-field-asterisk">
Name your collection:
</label>
<input
type="text"
name="add-to-new-collection"
id="collections-action-panel-add-to-new"
class="collections-action-add-to-new"
pattern="[^&quot;&amp;=&lt;&gt;\/]*" title="The following characters are not allowed in the Name field: &quot;&amp;=&lt;&gt;/"
maxlength="100"
data-ga-category="save_share"
data-ga-action="create_collection"
data-ga-label="non_favorties_collection">
<div class="collections-new-name-too-long usa-input-error-message selection-validation-message">
Name must be less than 100 characters
</div>
</div>
<div class="action-panel-control-wrap existing-collections-controls">
<label for="collections-action-panel-add-to-existing" class="action-panel-label">
Choose a collection:
</label>
<select id="collections-action-panel-add-to-existing"
class="action-panel-selector collections-action-add-to-existing"
data-ga-category="save_share"
data-ga-action="select_collection"
data-ga-label="($('#collections-action-add-to-existing').val() === 'Favorites') ? 'Favorites' : 'non_favorites_collection'">
</select>
<div class="collections-retry-load-on-error usa-input-error-message selection-validation-message">
Unable to load your collection due to an error<br>
<a href="#">Please try again</a>
</div>
</div>
</div>
<div class="action-panel-actions">
<button class="action-panel-submit"
type="submit"
data-loading-label="Adding..."
data-pinger-ignore
data-ga-category="save_share"
data-ga-action="collections"
data-ga-label="add">
Add
</button>
<button class="action-panel-cancel"
aria-label="Close 'Add to Collections' panel"
ref="linksrc=close_collections_panel"
aria-controls="collections-action-panel"
aria-expanded="false"
data-ga-category="save_share"
data-ga-action="collections"
data-ga-label="cancel">
Cancel
</button>
</div>
</form>
</div>
</div>
<div id="bibliography-action-panel"
class="bibliography-action-panel action-panel in-progress-dots-panel"
aria-hidden="true"
data-bibliography-open-panel-enabled="false"
data-bibliography-open-panel-url-hash="#open-bibliography-panel">
<div class="inner-wrap">
<h3 class="action-panel-heading">
Add to My Bibliography
</h3>
<form id="bibliography-action-panel-form"
class="bibliography-action-panel-form action-panel-content action-form action-panel-smaller-selectors"
data-add-to-bibliography-max-amount="100"
data-add-to-bibliography-batch-size="10"
data-bibliography-delegates-url="/list-bibliography-delegates/"
data-add-to-bibliography-url="/add-to-bibliography/"
data-get-article-ids-by-search-url="/get-article-ids-by-search/"
data-mybib-root-url="https://www.ncbi.nlm.nih.gov/myncbi/collections/mybibliography/">
<input type="hidden" name="csrfmiddlewaretoken" value="VX6obxuL6wXteBoxAT8ntclVJBz5h3xYcKQtOnX7G7KX82undcLpXkRzhFhhaE5i">
<div class="action-panel-control-wrap bibliographies-controls">
<div class="choice-group">
<ul class="bibliographies-action-add radio-group-items">
<li>
<input name="bibliography" id="my-bibliography" class="my-bibliography" type="radio" checked/>
<label for="my-bibliography">My Bibliography</label>
</li>
</ul>
</div>
</div>
<div class="bibliographies-retry-load-on-error usa-input-error-message selection-validation-message">
Unable to load your delegates due to an error<br>
<a href="#">Please try again</a>
</div>
<div class="action-panel-actions">
<button class="action-panel-submit"
type="submit"
data-loading-label="Adding..."
data-pinger-ignore>
Add
</button>
<button class="action-panel-cancel"
aria-label="Close 'Add to bibliography' panel"
ref="linksrc=close_bibliography_panel"
aria-controls="bibliography-action-panel"
aria-expanded="false"
data-ga-category="save_share"
data-ga-action="mybib"
data-ga-label="cancel">
Cancel
</button>
</div>
</form>
</div>
</div>
<div id="saved-search-action-panel" class="saved-search-action-panel action-panel " aria-hidden="true"
data-saved-search-open-panel-enabled="false"
data-saved-search-open-panel-url-hash="#open-saved-search-panel">
<div class="inner-wrap">
<h2 class="action-panel-heading">
Your saved search
</h2>
<form id="saved-search-action-panel-form"
class="saved-search-action-panel-form action-panel-content action-form"
data-create-saved-search-url="/create-saved-search/"
data-try-search-terms-url="/try-search-term/"
data-saved-search-root-url="https://www.ncbi.nlm.nih.gov/myncbi/searches/">
<input type="hidden" name="csrfmiddlewaretoken" value="VX6obxuL6wXteBoxAT8ntclVJBz5h3xYcKQtOnX7G7KX82undcLpXkRzhFhhaE5i">
<div class="action-panel-control-wrap">
<label for="saved-search-name" class="action-panel-label saved-search-name-label required-field-asterisk">
Name of saved search:
</label>
<input maxlength="200"
type="text"
name="saved-search-name"
id="saved-search-name"
class="saved-search-name"
value=""
required
pattern="[^&quot;&amp;=&lt;&gt;\/]*" title="The following characters are not allowed in the Name field: &quot;&amp;=&lt;&gt;/">
</div>
<div class="action-panel-control-wrap">
<label for="saved-search-term" class="action-panel-label required-field-asterisk">
Search terms:
</label>
<textarea name="saved-search-term" id="saved-search-term" class="saved-search-term" required></textarea>
</div>
<div class="test-search-term-wrap">
<a href="#" class="try-search-term">Test search terms</a>
</div>
<div class="choice-group action-panel-extra-margin-top">
<span class="action-panel-label" id="fieldset-label">
Would you like email updates of new search results?
</span>
<fieldset id="saved-search-alert" aria-describedby="fieldset-label">
<legend class="usa-sr-only">Saved Search Alert Radio Buttons</legend>
<ul class="radio-group-items">
<li>
<input type="radio" id="saved-search-alert-yes" class="saved-search-alert-yes" name="saved-search-alert" value="yes" checked>
<label for="saved-search-alert-yes" class="action-panel-label">Yes</label>
</li>
<li>
<input aria-label="No radio input" type="radio" id="saved-search-alert-no" class="saved-search-alert-no" name="saved-search-alert" value="no">
<label for="saved-search-alert-no" class="action-panel-label">No</label>
</li>
</ul>
</fieldset>
</div>
<div class="alert-schedule-wrap">
<div class="action-panel-control-wrap">
<label class="action-panel-label">
Email:
</label>
<span aria-label="Email address" id="saved-search-email" class="action-panel-label"><span class="action-panel-label-bold"></span> (<a class="myncbi-account-settings" href="https://www.ncbi.nlm.nih.gov/account/settings/">change</a>)</span>
</div>
<div class="action-panel-control-wrap action-panel-extra-margin-top">
<label for="saved-search-frequency" class="action-panel-label">
Frequency:
</label>
<select id="saved-search-frequency" class="no-border-panel-selector saved-search-frequency">
<option value="monthly">Monthly</option>
<option value="weekly">Weekly</option>
<option value="daily">Daily</option>
</select>
</div>
<div class="action-panel-control-wrap saved-search-monthly-additional">
<label for="saved-search-monthly-on-day" class="action-panel-label">
Which day?
</label>
<select id="saved-search-monthly-on-day" class="no-border-panel-selector">
<option value="Sunday">The first Sunday</option>
<option value="Monday">The first Monday</option>
<option value="Tuesday">The first Tuesday</option>
<option value="Wednesday">The first Wednesday</option>
<option value="Thursday">The first Thursday</option>
<option value="Friday">The first Friday</option>
<option value="Saturday">The first Saturday</option>
<option value="day">The first day</option>
<option value="weekday">The first weekday</option>
</select>
</div>
<div class="action-panel-control-wrap saved-search-weekly-additional">
<label for="saved-search-weekly-on-day" class="action-panel-label">
Which day?
</label>
<select id="saved-search-weekly-on-day" class="no-border-panel-selector saved-search-weekly-on-day">
<option value="Sunday">Sunday</option>
<option value="Monday">Monday</option>
<option value="Tuesday">Tuesday</option>
<option value="Wednesday">Wednesday</option>
<option value="Thursday">Thursday</option>
<option value="Friday">Friday</option>
<option value="Saturday">Saturday</option>
</select>
</div>
<div class="action-panel-control-wrap">
<label for="saved-search-report" class="action-panel-label">
Report format:
</label>
<select id="saved-search-report" class="no-border-panel-selector saved-search-report">
<option value="DocSum">Summary</option>
<option value="DocSumText">Summary (text)</option>
<option value="Abstract">Abstract</option>
<option value="AbstractText">Abstract (text)</option>
<option value="MEDLINE">PubMed</option>
</select>
</div>
<div class="action-panel-control-wrap">
<label for="saved-search-amount" class="action-panel-label">
Send at most:
</label>
<select id="saved-search-amount" class="no-border-panel-selector saved-search-amount">
<option value="1">1 item</option>
<option value="5" selected>5 items</option>
<option value="10">10 items</option>
<option value="20">20 items</option>
<option value="50">50 items</option>
<option value="100">100 items</option>
<option value="200">200 items</option>
</select>
</div>
<div>
<input type="checkbox" id="saved-search-send-if-no-result" class="saved-search-send-if-no-result" name="saved-search-send-if-no-result">
<label for="saved-search-send-if-no-result" class="action-panel-label smaller-checkbox">
Send even when there aren't any new results
</label>
</div>
<div class="action-panel-control-wrap option-text-in-email-wrap">
<label for="saved-search-email-text" class="action-panel-label">
Optional text in email:
</label>
<textarea name="saved-search-email-text"
id="saved-search-email-text"
class="saved-search-email-text"></textarea>
</div>
</div>
<div class="action-panel-actions">
<button class="action-panel-submit"
type="submit"
data-loading-label="Saving..."
data-ga-category="save_share"
data-ga-action="alert"
data-ga-label="save">
Save
</button>
<button class="action-panel-cancel"
aria-label="Close 'Your saved search' panel"
ref="linksrc=close_saved_search_panel"
aria-controls="saved-search-action-panel"
aria-expanded="false"
data-ga-category="save_share"
data-ga-action="alert"
data-ga-label="cancel">
Cancel
</button>
</div>
</form>
</div>
</div>
<div id="citation-manager-action-panel" class="citation-manager-action-panel action-panel" aria-hidden="true">
<div class="inner-wrap">
<h2 class="action-panel-heading">
Create a file for external citation management software
</h2>
<form id="citation-manager-action-panel-form"
class="action-panel-content action-form"
action="/results-export-ids/"
data-by-search-action="/results-export-search-data/"
data-by-ids-action="/results-export-ids/"
method="post"
data-by-search-method="post"
data-by-ids-method="post">
<input type="hidden" name="csrfmiddlewaretoken" value="VX6obxuL6wXteBoxAT8ntclVJBz5h3xYcKQtOnX7G7KX82undcLpXkRzhFhhaE5i">
<input name="results-format" type="hidden" value="pubmed"/>
<div class="action-panel-actions">
<button class="action-panel-submit"
type="submit"
data-loading-label="Sending..."
data-ga-category="save_share"
data-ga-action="citation_manager"
data-ga-label="save">
Create file
</button>
<button class="action-panel-cancel"
aria-label="Close 'Send citations to citation manager' panel"
ref="linksrc=close_citation_manager_panel"
aria-controls="citation-manager-action-panel"
aria-expanded="false"
data-ga-category="save_share"
data-ga-action="citation_manager"
data-ga-label="cancel">
Cancel
</button>
</div>
</form>
</div>
</div>
<div id="rss-action-panel" class="rss-action-panel action-panel " aria-hidden="true">
<div class="inner-wrap">
<h2 class="action-panel-heading">
Your RSS Feed
</h2>
<form id="rss-action-panel-form"
class="rss-action-panel-form action-panel-content action-form"
data-create-rss-feed-url="/create-rss-feed-url/"
data-search-form-term-value="">
<input type="hidden" name="csrfmiddlewaretoken" value="VX6obxuL6wXteBoxAT8ntclVJBz5h3xYcKQtOnX7G7KX82undcLpXkRzhFhhaE5i">
<div class="action-panel-control-wrap">
<label for="rss-name" class="action-panel-label required-field-asterisk">
Name of RSS Feed:
</label>
<input maxlength="200"
placeholder="Name"
type="text"
name="rss-name"
id="rss-name"
class="rss-name"
value=''
required
pattern="[^&quot;&amp;=&lt;&gt;\/]*" title="The following characters are not allowed in the Name field: &quot;&amp;=&lt;&gt;/">
</div>
<div class="rss-limit-wrap">
<div class="action-panel-control-wrap action-panel-extra-margin-top">
<label for="rss-limit" class="action-panel-label">
Number of items displayed:
</label>
<select id="rss-limit" class="no-border-panel-selector rss-limit">
<option value="5">5</option>
<option value="10">10</option>
<option value="15" selected="selected">15</option>
<option value="20">20</option>
<option value="50">50</option>
<option value="100">100</option>
</select>
</div>
</div>
<div class="action-panel-actions">
<button class="action-panel-submit"
type="submit"
data-loading-label="Creating..."
data-ga-category="save_share"
data-ga-action="alert"
data-ga-label="save">
Create RSS
</button>
<button class="action-panel-cancel"
aria-label="Close 'Your RSS' panel"
ref="linksrc=close_rss_panel"
aria-controls="rss-action-panel"
aria-expanded="false"
data-ga-category="save_share"
data-ga-action="alert"
data-ga-label="cancel">
Cancel
</button>
</div>
<div class="action-panel-control-wrap rss-link-copy-wrap">
<label for="rss-link" class="usa-sr-only">RSS Link</label>
<input placeholder="Your RSS Feed Link" type="text" name="rss-link" id="rss-link" class="rss-link" title="RSS Link">
<button
type="button"
disabled
class="rss-link-copy-button disabled"
data-ga-category="save_share"
data-ga-action="rss"
data-ga-label="copy">
Copy
</button>
</div>
</form>
</div>
</div>
</div>
</div>
<div class="article-page" id="article-page" data-article-pmid="34016200">
<aside class="page-sidebar">
<div class="inner-wrap">
<div class="full-text-links">
<div class="full-view">
<h3 class="title">
Full text links
</h3>
<div class="full-text-links-list">
<a class="link-item
dialog-focus"
href="https://www.cambridge.org/core/product/identifier/S0899823X21002300/type/journal_article"
target="_blank"
rel="noopener"
ref="linksrc=fulltextorjournal_fulltext&amp;is_pmc=False&amp;PrId=3288&amp;itool=Abstract-def&amp;log$=linkouticon&amp;uid=34016200&amp;db=pubmed&amp;nlmid=8804099"
title="See full text options at Cambridge University Press"
data-ga-category="full_text"
data-ga-action="Cambridge University Press"
data-ga-label="34016200"
><img src="https://cdn.ncbi.nlm.nih.gov/corehtml/query/egifs/https:--www.cambridge.org-core-services-aop-file-manager-file-674855a637a5f5cce65d917f-CUP-PubMed-button.png" alt="Cambridge University Press full text link"><span class="text">
Cambridge University Press
</span></a><a class="link-item
pmc
"
href="https://pmc.ncbi.nlm.nih.gov/articles/pmid/34016200/"
target="_blank"
rel="noopener"
ref="linksrc=fulltextorjournal_fulltext&amp;is_pmc=True&amp;PrId=3494&amp;itool=Abstract-def&amp;log$=linkouticon&amp;uid=34016200&amp;db=pubmed&amp;nlmid=8804099"
title="Free full text at PubMed Central"
data-ga-category="full_text"
data-ga-action="PMC"
data-ga-label="34016200"
><span class="text">
Free PMC article
</span></a>
</div>
</div>
<div class="short-view">
<a href="#" class="full-text-links-button full-text-links-dialog-trigger">
Full text links
</a>
</div>
</div>
<div class="actions-buttons sidebar"><h3 class="title">Actions</h3><div class="inner-wrap"><button class="citation-button citation-dialog-trigger"
aria-label="Open dialog with citation text in different styles"
data-ga-category="save_share"
data-ga-action="cite"
data-ga-label="open"
data-all-citations-url="/34016200/citations/"
data-citation-style="nlm"
data-pubmed-format-link="/34016200/export/"><span class="button-label">Cite</span></button><link type="text/css" href="ncbi-overlay-block/src/overlay-block.css"><div class="collections-button-container" data-article-id="34016200" data-article-db="pubmed"><button class="collections-button collections-dialog-trigger"
aria-label="Save article in MyNCBI collections."
data-ga-category="collections_button"
data-ga-action="click"
data-ga-label="collections_button"
data-collections-open-dialog-enabled="false"
data-collections-open-dialog-url="https://account.ncbi.nlm.nih.gov/?back_url=https%3A%2F%2Fpubmed.ncbi.nlm.nih.gov%2F34016200%2F%23open-collections-dialog"
data-in-collections="false"><span class="button-label">Collections</span></button><div class="overlay" role="dialog"><div id="collections-action-dialog"
class="dialog collections-dialog"
aria-hidden="true"><div class="title">Add to Collections</div><div class="collections-action-panel action-panel"><form id="collections-action-dialog-form"
class="collections-action-panel-form action-panel-content action-form action-panel-smaller-selectors"
data-existing-collections-url="/list-existing-collections/"
data-add-to-existing-collection-url="/add-to-existing-collection/"
data-create-and-add-to-new-collection-url="/create-and-add-to-new-collection/"
data-myncbi-max-collection-name-length="100"
data-collections-root-url="https://www.ncbi.nlm.nih.gov/myncbi/collections/"><input type="hidden" name="csrfmiddlewaretoken" value="VX6obxuL6wXteBoxAT8ntclVJBz5h3xYcKQtOnX7G7KX82undcLpXkRzhFhhaE5i"><div class="choice-group" role="radiogroup"><ul class="radio-group-items"><li><input type="radio"
id="collections-action-dialog-new"
class="collections-new"
name="collections"
value="new"
data-ga-category="collections_button"
data-ga-action="click"
data-ga-label="collections_radio_new"><label for="collections-action-dialog-new">Create a new collection</label></li><li><input type="radio"
id="collections-action-dialog-existing"
class="collections-existing"
name="collections"
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<h1 class="heading-title">
Addressing personal protective equipment (PPE) decontamination: Methylene blue and light inactivates severe acute respiratory coronavirus virus 2 (SARS-CoV-2) on N95 respirators and medical masks with maintenance of integrity and fit
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11
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18
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18
</a></sup><span class="comma">,&nbsp;</span></span><span class="authors-list-item "><a class="full-name"
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14
</a></sup><span class="comma">,&nbsp;</span></span><span class="authors-list-item "><a class="full-name"
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10
</a></sup><span class="comma">,&nbsp;</span></span><span class="authors-list-item "><a class="full-name"
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10
</a></sup><span class="comma">,&nbsp;</span></span><span class="authors-list-item "><a class="full-name"
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19
</a></sup><span class="comma">,&nbsp;</span></span><span class="authors-list-item "><a class="full-name"
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14
</a></sup><span class="comma">,&nbsp;</span></span><span class="authors-list-item "><a class="full-name"
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19
</a></sup><span class="comma">,&nbsp;</span></span><span class="authors-list-item "><a class="full-name"
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14
</a></sup><span class="comma">,&nbsp;</span></span><span class="authors-list-item "><a class="full-name"
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14
</a><span class="author-sup-separator">&nbsp;</span><a class="affiliation-link" title="W21C Research and Innovation Centre, University of Calgary, Calgary, Alberta, Canada." href="#full-view-affiliation-19" ref="linksrc=author_aff">
19
</a><span class="author-sup-separator">&nbsp;</span><a class="affiliation-link" title="Department of Anesthesiology, Perioperative and Pain Medicine, University of Calgary, Calgary, Alberta, Canada." href="#full-view-affiliation-20" ref="linksrc=author_aff">
20
</a></sup><span class="comma">,&nbsp;</span></span><span class="authors-list-item "><a class="full-name"
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12
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16
</a></sup><span class="comma">,&nbsp;</span></span><span class="authors-list-item "><a class="full-name"
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21
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15
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16
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22
</a></sup><span class="comma">,&nbsp;</span></span><span class="authors-list-item "><a class="full-name"
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22
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23
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23
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24
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24
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25
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26
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26
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27
</a></sup><span class="comma">,&nbsp;</span></span><span class="authors-list-item "><a class="full-name"
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19
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Affiliations
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<li data-affiliation-id="full-view-affiliation-1"
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><sup class="key">1</sup> Department of Urology, University of Washington School of Medicine, Seattle Children&#x27;s Hospital, Seattle, Washington, United States.</li>
<li data-affiliation-id="full-view-affiliation-2"
id="full-view-affiliation-2"
><sup class="key">2</sup> Viral Special Pathogens Branch, Division of High Consequence Pathogens and Pathology, National Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia, United States.</li>
<li data-affiliation-id="full-view-affiliation-3"
id="full-view-affiliation-3"
><sup class="key">3</sup> Department of Infectious Diseases, Microbiology and Immunology, CRCHU de Québec-Université Laval, Québec, Québec, Canada.</li>
<li data-affiliation-id="full-view-affiliation-4"
id="full-view-affiliation-4"
><sup class="key">4</sup> World Health Organization, Geneva, Switzerland.</li>
<li data-affiliation-id="full-view-affiliation-5"
id="full-view-affiliation-5"
><sup class="key">5</sup> National Personal Protective Technology Laboratory (NPPTL), National Institute for Occupational Safety and Health (NIOSH), Centers for Disease Control and Prevention (CDC), Pittsburgh, Pennsylvania, United States.</li>
<li data-affiliation-id="full-view-affiliation-6"
id="full-view-affiliation-6"
><sup class="key">6</sup> Department of Epidemiology, Colorado School of Public Health, Anschutz Medical Campus, Aurora, Colorado, United States.</li>
<li data-affiliation-id="full-view-affiliation-7"
id="full-view-affiliation-7"
><sup class="key">7</sup> Center for Global Health, Colorado School of Public Health, Anschutz Medical Campus, Aurora, Colorado, United States.</li>
<li data-affiliation-id="full-view-affiliation-8"
id="full-view-affiliation-8"
><sup class="key">8</sup> Department of Materials Science and Engineering, Stanford University, Stanford, California, United States.</li>
<li data-affiliation-id="full-view-affiliation-9"
id="full-view-affiliation-9"
><sup class="key">9</sup> The Anesthesia, Informatics and Media (AIM) Lab, Stanford University School of Medicine, Stanford, California, United States.</li>
<li data-affiliation-id="full-view-affiliation-10"
id="full-view-affiliation-10"
><sup class="key">10</sup> Department of Chemistry, University of Calgary, Calgary, Alberta, Canada.</li>
<li data-affiliation-id="full-view-affiliation-11"
id="full-view-affiliation-11"
><sup class="key">11</sup> Seattle Children&#x27;s Research Institute, Seattle, Washington, United States.</li>
<li data-affiliation-id="full-view-affiliation-12"
id="full-view-affiliation-12"
><sup class="key">12</sup> Department of Global Health, Milken Institute School of Public Health, The George Washington University, Washington, DC, United States.</li>
<li data-affiliation-id="full-view-affiliation-13"
id="full-view-affiliation-13"
><sup class="key">13</sup> Department of Medical Microbiology and Immunology, University of Alberta, Edmonton, Alberta, Canada.</li>
<li data-affiliation-id="full-view-affiliation-14"
id="full-view-affiliation-14"
><sup class="key">14</sup> Alberta Health Services, Alberta, Canada.</li>
<li data-affiliation-id="full-view-affiliation-15"
id="full-view-affiliation-15"
><sup class="key">15</sup> Gembloux AgroBioTech, Terra Research Center, University of Liège, Gembloux, Belgium.</li>
<li data-affiliation-id="full-view-affiliation-16"
id="full-view-affiliation-16"
><sup class="key">16</sup> Department of Infectious and Parasitic Diseases, Faculty of Veterinary Medicine, University of Liège, Liège, Belgium.</li>
<li data-affiliation-id="full-view-affiliation-17"
id="full-view-affiliation-17"
><sup class="key">17</sup> Department of Radiology, University of Washington School of Medicine, Seattle, Washington, United States.</li>
<li data-affiliation-id="full-view-affiliation-18"
id="full-view-affiliation-18"
><sup class="key">18</sup> Department of Microbiology and Immunology, Loyola University Chicago, Maywood, Illinois, United States.</li>
<li data-affiliation-id="full-view-affiliation-19"
id="full-view-affiliation-19"
><sup class="key">19</sup> W21C Research and Innovation Centre, University of Calgary, Calgary, Alberta, Canada.</li>
<li data-affiliation-id="full-view-affiliation-20"
id="full-view-affiliation-20"
><sup class="key">20</sup> Department of Anesthesiology, Perioperative and Pain Medicine, University of Calgary, Calgary, Alberta, Canada.</li>
<li data-affiliation-id="full-view-affiliation-21"
id="full-view-affiliation-21"
><sup class="key">21</sup> Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium.</li>
<li data-affiliation-id="full-view-affiliation-22"
id="full-view-affiliation-22"
><sup class="key">22</sup> 4CAir, Inc, Sunnyvale, California, United States.</li>
<li data-affiliation-id="full-view-affiliation-23"
id="full-view-affiliation-23"
><sup class="key">23</sup> Centexbel, Grace-Hollogne, Belgium.</li>
<li data-affiliation-id="full-view-affiliation-24"
id="full-view-affiliation-24"
><sup class="key">24</sup> Nelson Laboratories, Salt Lake City, Utah, United States.</li>
<li data-affiliation-id="full-view-affiliation-25"
id="full-view-affiliation-25"
><sup class="key">25</sup> British Standards Institution, London, United Kingdom.</li>
<li data-affiliation-id="full-view-affiliation-26"
id="full-view-affiliation-26"
><sup class="key">26</sup> Stryker, Québec, Québec, Canada.</li>
<li data-affiliation-id="full-view-affiliation-27"
id="full-view-affiliation-27"
><sup class="key">27</sup> Department of Physics, Molecular and Cellular Physiology, Stanford University, Stanford, California, United States.</li>
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Addressing personal protective equipment (PPE) decontamination: Methylene blue and light inactivates severe acute respiratory coronavirus virus 2 (SARS-CoV-2) on N95 respirators and medical masks with maintenance of integrity and fit
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<span class="authors-list-item "><span class="full-name">Thomas Sean Lendvay</span><span class="citation-separator">&nbsp;et al.</span></span>
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<span class="citation-year">2022 Jul</span><span class="citation-separator">.</span>
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</a><span class="author-sup-separator">&nbsp;</span><a class="affiliation-link" title="W21C Research and Innovation Centre, University of Calgary, Calgary, Alberta, Canada." href="#short-view-affiliation-19" ref="linksrc=author_aff">
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</a><span class="author-sup-separator">&nbsp;</span><a class="affiliation-link" title="Department of Anesthesiology, Perioperative and Pain Medicine, University of Calgary, Calgary, Alberta, Canada." href="#short-view-affiliation-20" ref="linksrc=author_aff">
20
</a></sup><span class="comma">,&nbsp;</span></span><span class="authors-list-item "><a class="full-name"
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12
</a></sup><span class="comma">,&nbsp;</span></span><span class="authors-list-item "><a class="full-name"
href="/?term=Dams+L&amp;cauthor_id=34016200"
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16
</a></sup><span class="comma">,&nbsp;</span></span><span class="authors-list-item "><a class="full-name"
href="/?term=Nauwynck+H&amp;cauthor_id=34016200"
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21
</a></sup><span class="comma">,&nbsp;</span></span><span class="authors-list-item "><a class="full-name"
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15
</a></sup><span class="comma">,&nbsp;</span></span><span class="authors-list-item "><a class="full-name"
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16
</a></sup><span class="comma">,&nbsp;</span></span><span class="authors-list-item "><a class="full-name"
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22
</a></sup><span class="comma">,&nbsp;</span></span><span class="authors-list-item "><a class="full-name"
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22
</a></sup><span class="comma">,&nbsp;</span></span><span class="authors-list-item "><a class="full-name"
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23
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23
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24
</a></sup><span class="comma">,&nbsp;</span></span><span class="authors-list-item "><a class="full-name"
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24
</a></sup><span class="comma">,&nbsp;</span></span><span class="authors-list-item "><a class="full-name"
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25
</a></sup><span class="comma">,&nbsp;</span></span><span class="authors-list-item "><a class="full-name"
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26
</a></sup><span class="comma">,&nbsp;</span></span><span class="authors-list-item "><a class="full-name"
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26
</a></sup><span class="comma">,&nbsp;</span></span><span class="authors-list-item "><a class="full-name"
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26
</a></sup><span class="comma">,&nbsp;</span></span><span class="authors-list-item "><a class="full-name"
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27
</a></sup><span class="comma">,&nbsp;</span></span><span class="authors-list-item "><a class="full-name"
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19
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7
</a></sup></span>
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<div class="affiliations">
<h3 class="title">
Affiliations
</h3>
<ul class="item-list">
<li data-affiliation-id="short-view-affiliation-1"
id="short-view-affiliation-1"
><sup class="key">1</sup> Department of Urology, University of Washington School of Medicine, Seattle Children&#x27;s Hospital, Seattle, Washington, United States.</li>
<li data-affiliation-id="short-view-affiliation-2"
id="short-view-affiliation-2"
><sup class="key">2</sup> Viral Special Pathogens Branch, Division of High Consequence Pathogens and Pathology, National Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia, United States.</li>
<li data-affiliation-id="short-view-affiliation-3"
id="short-view-affiliation-3"
><sup class="key">3</sup> Department of Infectious Diseases, Microbiology and Immunology, CRCHU de Québec-Université Laval, Québec, Québec, Canada.</li>
<li data-affiliation-id="short-view-affiliation-4"
id="short-view-affiliation-4"
><sup class="key">4</sup> World Health Organization, Geneva, Switzerland.</li>
<li data-affiliation-id="short-view-affiliation-5"
id="short-view-affiliation-5"
><sup class="key">5</sup> National Personal Protective Technology Laboratory (NPPTL), National Institute for Occupational Safety and Health (NIOSH), Centers for Disease Control and Prevention (CDC), Pittsburgh, Pennsylvania, United States.</li>
<li data-affiliation-id="short-view-affiliation-6"
id="short-view-affiliation-6"
><sup class="key">6</sup> Department of Epidemiology, Colorado School of Public Health, Anschutz Medical Campus, Aurora, Colorado, United States.</li>
<li data-affiliation-id="short-view-affiliation-7"
id="short-view-affiliation-7"
><sup class="key">7</sup> Center for Global Health, Colorado School of Public Health, Anschutz Medical Campus, Aurora, Colorado, United States.</li>
<li data-affiliation-id="short-view-affiliation-8"
id="short-view-affiliation-8"
><sup class="key">8</sup> Department of Materials Science and Engineering, Stanford University, Stanford, California, United States.</li>
<li data-affiliation-id="short-view-affiliation-9"
id="short-view-affiliation-9"
><sup class="key">9</sup> The Anesthesia, Informatics and Media (AIM) Lab, Stanford University School of Medicine, Stanford, California, United States.</li>
<li data-affiliation-id="short-view-affiliation-10"
id="short-view-affiliation-10"
><sup class="key">10</sup> Department of Chemistry, University of Calgary, Calgary, Alberta, Canada.</li>
<li data-affiliation-id="short-view-affiliation-11"
id="short-view-affiliation-11"
><sup class="key">11</sup> Seattle Children&#x27;s Research Institute, Seattle, Washington, United States.</li>
<li data-affiliation-id="short-view-affiliation-12"
id="short-view-affiliation-12"
><sup class="key">12</sup> Department of Global Health, Milken Institute School of Public Health, The George Washington University, Washington, DC, United States.</li>
<li data-affiliation-id="short-view-affiliation-13"
id="short-view-affiliation-13"
><sup class="key">13</sup> Department of Medical Microbiology and Immunology, University of Alberta, Edmonton, Alberta, Canada.</li>
<li data-affiliation-id="short-view-affiliation-14"
id="short-view-affiliation-14"
><sup class="key">14</sup> Alberta Health Services, Alberta, Canada.</li>
<li data-affiliation-id="short-view-affiliation-15"
id="short-view-affiliation-15"
><sup class="key">15</sup> Gembloux AgroBioTech, Terra Research Center, University of Liège, Gembloux, Belgium.</li>
<li data-affiliation-id="short-view-affiliation-16"
id="short-view-affiliation-16"
><sup class="key">16</sup> Department of Infectious and Parasitic Diseases, Faculty of Veterinary Medicine, University of Liège, Liège, Belgium.</li>
<li data-affiliation-id="short-view-affiliation-17"
id="short-view-affiliation-17"
><sup class="key">17</sup> Department of Radiology, University of Washington School of Medicine, Seattle, Washington, United States.</li>
<li data-affiliation-id="short-view-affiliation-18"
id="short-view-affiliation-18"
><sup class="key">18</sup> Department of Microbiology and Immunology, Loyola University Chicago, Maywood, Illinois, United States.</li>
<li data-affiliation-id="short-view-affiliation-19"
id="short-view-affiliation-19"
><sup class="key">19</sup> W21C Research and Innovation Centre, University of Calgary, Calgary, Alberta, Canada.</li>
<li data-affiliation-id="short-view-affiliation-20"
id="short-view-affiliation-20"
><sup class="key">20</sup> Department of Anesthesiology, Perioperative and Pain Medicine, University of Calgary, Calgary, Alberta, Canada.</li>
<li data-affiliation-id="short-view-affiliation-21"
id="short-view-affiliation-21"
><sup class="key">21</sup> Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium.</li>
<li data-affiliation-id="short-view-affiliation-22"
id="short-view-affiliation-22"
><sup class="key">22</sup> 4CAir, Inc, Sunnyvale, California, United States.</li>
<li data-affiliation-id="short-view-affiliation-23"
id="short-view-affiliation-23"
><sup class="key">23</sup> Centexbel, Grace-Hollogne, Belgium.</li>
<li data-affiliation-id="short-view-affiliation-24"
id="short-view-affiliation-24"
><sup class="key">24</sup> Nelson Laboratories, Salt Lake City, Utah, United States.</li>
<li data-affiliation-id="short-view-affiliation-25"
id="short-view-affiliation-25"
><sup class="key">25</sup> British Standards Institution, London, United Kingdom.</li>
<li data-affiliation-id="short-view-affiliation-26"
id="short-view-affiliation-26"
><sup class="key">26</sup> Stryker, Québec, Québec, Canada.</li>
<li data-affiliation-id="short-view-affiliation-27"
id="short-view-affiliation-27"
><sup class="key">27</sup> Department of Physics, Molecular and Cellular Physiology, Stanford University, Stanford, California, United States.</li>
</ul>
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<h2 class="title">
Abstract
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<p>
<strong class="sub-title">
Objective:
</strong>
The coronavirus disease 2019 (COVID-19) pandemic has resulted in shortages of personal protective equipment (PPE), underscoring the urgent need for simple, efficient, and inexpensive methods to decontaminate masks and respirators exposed to severe acute respiratory coronavirus virus 2 (SARS-CoV-2). We hypothesized that methylene blue (MB) photochemical treatment, which has various clinical applications, could decontaminate PPE contaminated with coronavirus.
</p>
<p>
<strong class="sub-title">
Design:
</strong>
The 2 arms of the study included (1) PPE inoculation with coronaviruses followed by MB with light (MBL) decontamination treatment and (2) PPE treatment with MBL for 5 cycles of decontamination to determine maintenance of PPE performance.
</p>
<p>
<strong class="sub-title">
Methods:
</strong>
MBL treatment was used to inactivate coronaviruses on 3 N95 filtering facepiece respirator (FFR) and 2 medical mask models. We inoculated FFR and medical mask materials with 3 coronaviruses, including SARS-CoV-2, and we treated them with 10 µM MB and exposed them to 50,000 lux of white light or 12,500 lux of red light for 30 minutes. In parallel, integrity was assessed after 5 cycles of decontamination using multiple US and international test methods, and the process was compared with the FDA-authorized vaporized hydrogen peroxide plus ozone (VHP+O<sub>3</sub>) decontamination method.
</p>
<p>
<strong class="sub-title">
Results:
</strong>
Overall, MBL robustly and consistently inactivated all 3 coronaviruses with 99.8% to &gt;99.9% virus inactivation across all FFRs and medical masks tested. FFR and medical mask integrity was maintained after 5 cycles of MBL treatment, whereas 1 FFR model failed after 5 cycles of VHP+O<sub>3</sub>.
</p>
<p>
<strong class="sub-title">
Conclusions:
</strong>
MBL treatment decontaminated respirators and masks by inactivating 3 tested coronaviruses without compromising integrity through 5 cycles of decontamination. MBL decontamination is effective, is low cost, and does not require specialized equipment, making it applicable in low- to high-resource settings.
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<p> Fig. 1. </p>
</strong>
<div class="figure-caption-contents"><p> Graphical representation of the DeMaND… </p></div>
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<p> Fig. 1. </p>
</strong>
<div class="figure-caption-contents"><p> Graphical representation of the DeMaND study methodology. (A) Overview of the coronaviruses, respirators,… </p></div>
</div>
<figcaption id="figure-caption-0" class="figure-caption-full figure-caption-text" itemtype="http://schema.org/ImageObject" itemprop="description">
<strong class="figure-label">
Fig. 1.
</strong>
<div class="figure-caption-contents">Graphical representation of the DeMaND study methodology. (A) Overview of the coronaviruses, respirators, masks, and decontamination methods used. (B) FFRs and medical masks were inoculated with virus and treated with MBL. The remaining infectious virus was quantified using TCID<sub>50</sub> or plaque assay. (C) In parallel with the virucidal testing of MBL, intact FFRs and medical masks were subjected to 5 cycles of decontamination before mask integrity was tested using the indicated methods. Note. FFR, filtering facepiece respirator; PRCV, porcine respiratory coronavirus; SARS-CoV-2, severe acute respiratory syndrome coronavirus 2; MHV, murine hepatitis virus; MBL, methylene blue + light; VHP+O<sub>3</sub>, vaporized hydrogen peroxide plus ozone. See Supplemental Table <ext-link xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="uri" xlink:href="https://doi.org/10.1017/ice.2021.230">S1</ext-link> (online) for the respirator and mask decontamination and testing matrix.</div>
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aria-describedby="figure-caption-1"
role="button"
data-image-width="756"
data-image-height="299"
data-image-alt="Fig. 2."
data-pmc-id="PMC8220024"
data-figure-id="f2">
<img class="figure-thumb" itemprop="thumbnail"
id="article-image-1"
src="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/223f/9272543/ef985fefce57/S0899823X21002300_fig2.gif"
alt="Fig. 2." />
</a>
<meta itemprop="width" itemtype="http://schema.org/ImageObject" content="756">
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<div class="figure-caption figure-caption-text" itemtype="http://schema.org/ImageObject" itemprop="caption" aria-hidden="true">
<div class="caption-wrap">
<strong class="figure-label">
<p> Fig. 2. </p>
</strong>
<div class="figure-caption-contents"><p> Inactivation of PRCV and SARS-CoV-2… </p></div>
</div>
</div>
<div class="figure-caption-medium figure-caption-text" aria-hidden="true">
<strong class="figure-label">
<p> Fig. 2. </p>
</strong>
<div class="figure-caption-contents"><p> Inactivation of PRCV and SARS-CoV-2 using MBL. (A) To determine the efficacy of… </p></div>
</div>
<figcaption id="figure-caption-1" class="figure-caption-full figure-caption-text" itemtype="http://schema.org/ImageObject" itemprop="description">
<strong class="figure-label">
Fig. 2.
</strong>
<div class="figure-caption-contents">Inactivation of PRCV and SARS-CoV-2 using MBL. (A) To determine the efficacy of different MB concentrations, we added serial dilutions of MB to wells of a 48-well plate containing 10 µL PRCV (2×10<sup>7</sup> TCID<sub>50</sub>/ml). Plates were either exposed to red light (12,500 lux) for 30 minutes or were protected from light (&lt;100 lux). The dotted line indicates the limit of detection. (B) We added serial dilutions of MB to wells of a 12-well plate containing ~50 PFU SARS-CoV-2 in MEM plus 15% FCS. Plates were either exposed to white light (50,000 lux) for 45 minutes or protected from light (&lt;100 lux). We determined viral titers using 23 replicate samples. Note. FCS, fetal calf serum; MEM, minimum essential media, ND, not detected.</div>
</figcaption>
</figure>
<figure class="figure-item "
itemscope itemtype="http://schema.org/ImageObject"
itemprop="associatedMedia"
data-slide-index="2"
data-label-slug="fig-3">
<a class="figure-link"
href="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/223f/9272543/58cc06ed9404/S0899823X21002300_fig3.jpg"
itemprop="contentUrl"
aria-describedby="figure-caption-2"
role="button"
data-image-width="4200"
data-image-height="2003"
data-image-alt="Fig. 3."
data-pmc-id="PMC8220024"
data-figure-id="f3">
<img class="figure-thumb" itemprop="thumbnail"
id="article-image-2"
src="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/223f/9272543/404ac674c785/S0899823X21002300_fig3.gif"
alt="Fig. 3." />
</a>
<meta itemprop="width" itemtype="http://schema.org/ImageObject" content="4200">
<meta itemprop="height" itemtype="http://schema.org/ImageObject" content="2003">
<div class="figure-caption figure-caption-text" itemtype="http://schema.org/ImageObject" itemprop="caption" aria-hidden="true">
<div class="caption-wrap">
<strong class="figure-label">
<p> Fig. 3. </p>
</strong>
<div class="figure-caption-contents"><p> MBL inactivates MHV and SARS-CoV-2… </p></div>
</div>
</div>
<div class="figure-caption-medium figure-caption-text" aria-hidden="true">
<strong class="figure-label">
<p> Fig. 3. </p>
</strong>
<div class="figure-caption-contents"><p> MBL inactivates MHV and SARS-CoV-2 on FFR and medical mask material. (A) Effect… </p></div>
</div>
<figcaption id="figure-caption-2" class="figure-caption-full figure-caption-text" itemtype="http://schema.org/ImageObject" itemprop="description">
<strong class="figure-label">
Fig. 3.
</strong>
<div class="figure-caption-contents">MBL inactivates MHV and SARS-CoV-2 on FFR and medical mask material. (A) Effect of MBL treatment on MHV and SARS-CoV-2 titers. We applied a 10-µL aliquot of MHV or SARS-CoV-2 to coupons derived from an FFR (R3) or medical mask (FW) and they were left to dry for 20 minutes. Subsequently, we added 10 or 30 µL MB to each coupon at the indicated concentrations. We exposed the samples to white light (50,000 lux) for the indicated periods or left them in the biosafety cabinet with the lights off. We measured each virus titer using 26 replicate samples by TCID<sub>50</sub> or plaque assay. Data are represented as mean ± SD. Note. PFU, plaque forming units; R3, 3M panel respirator (1870+) FW, Type II EN 14683 generic face mask. The dotted line indicates the limit of detection.</div>
</figcaption>
</figure>
<figure class="figure-item "
itemscope itemtype="http://schema.org/ImageObject"
itemprop="associatedMedia"
data-slide-index="3"
data-label-slug="fig-4">
<a class="figure-link"
href="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/223f/9272543/e39297f8fbd3/S0899823X21002300_fig4.jpg"
itemprop="contentUrl"
aria-describedby="figure-caption-3"
role="button"
data-image-width="4202"
data-image-height="751"
data-image-alt="Fig. 4."
data-pmc-id="PMC8220024"
data-figure-id="f4">
<img class="figure-thumb" itemprop="thumbnail"
id="article-image-3"
src="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/223f/9272543/cfb3924c0893/S0899823X21002300_fig4.gif"
alt="Fig. 4." />
</a>
<meta itemprop="width" itemtype="http://schema.org/ImageObject" content="4202">
<meta itemprop="height" itemtype="http://schema.org/ImageObject" content="751">
<div class="figure-caption figure-caption-text" itemtype="http://schema.org/ImageObject" itemprop="caption" aria-hidden="true">
<div class="caption-wrap">
<strong class="figure-label">
<p> Fig. 4. </p>
</strong>
<div class="figure-caption-contents"><p> MBL inactivates MHV, SARS-CoV-2, and… </p></div>
</div>
</div>
<div class="figure-caption-medium figure-caption-text" aria-hidden="true">
<strong class="figure-label">
<p> Fig. 4. </p>
</strong>
<div class="figure-caption-contents"><p> MBL inactivates MHV, SARS-CoV-2, and PRCV on multiple FFR and medical mask types.… </p></div>
</div>
<figcaption id="figure-caption-3" class="figure-caption-full figure-caption-text" itemtype="http://schema.org/ImageObject" itemprop="description">
<strong class="figure-label">
Fig. 4.
</strong>
<div class="figure-caption-contents">MBL inactivates MHV, SARS-CoV-2, and PRCV on multiple FFR and medical mask types. (AC) We applied a 10-µL aliquot of SARS-CoV-2 or MHV to coupons of the indicated masks and dried them for 20 minutes. Depending on coupon size, we added 1030 µL of 10 µM MB to each coupon and then treated the samples with light (50,000 lux) or protected them from light. (D) We injected 100 µL PRCV under the outer layer of intact FFRs or medical masks and allowed them to dry for 30 minutes. Subsequently, we sprayed the FFRs and medical masks with 10 µM MB and dried them for 30 minutes in the dark before exposure to red light (12,500 lux). We determined each virus titer using 26 replicate samples by TCID<sub>50</sub> or plaque assay. Data are represented as mean ± SD. Note. PRCV, porcine respiratory coronavirus; MBL, methylene blue, and light; MHV, murine hepatitis virus; FFR, filtering facepiece respirator; MB, methylene blue; TCID<sub>50</sub>, median tissue culture infectious dose; ND, not detected; RH, Halyard duckbill respirator (Fluidshield-46727); RM, 3M half-sphere respirator (1860); R3, 3M panel respirator (1870+); FW, Type II EN 14683 generic face mask; FH, Type IIR ASTM F2100 Level 2 Halyard face mask. The dotted line indicates the limit of detection.</div>
</figcaption>
</figure>
<figure class="figure-item "
itemscope itemtype="http://schema.org/ImageObject"
itemprop="associatedMedia"
data-slide-index="4"
data-label-slug="fig-5">
<a class="figure-link"
href="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/223f/9272543/912c14ce7bf1/S0899823X21002300_fig5.jpg"
itemprop="contentUrl"
aria-describedby="figure-caption-4"
role="button"
data-image-width="762"
data-image-height="610"
data-image-alt="Fig. 5."
data-pmc-id="PMC8220024"
data-figure-id="f5">
<img class="figure-thumb" itemprop="thumbnail"
id="article-image-4"
src="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/223f/9272543/055e0df77db9/S0899823X21002300_fig5.gif"
alt="Fig. 5." />
</a>
<meta itemprop="width" itemtype="http://schema.org/ImageObject" content="762">
<meta itemprop="height" itemtype="http://schema.org/ImageObject" content="610">
<div class="figure-caption figure-caption-text" itemtype="http://schema.org/ImageObject" itemprop="caption" aria-hidden="true">
<div class="caption-wrap">
<strong class="figure-label">
<p> Fig. 5. </p>
</strong>
<div class="figure-caption-contents"><p> Potential applications of MBL in… </p></div>
</div>
</div>
<div class="figure-caption-medium figure-caption-text" aria-hidden="true">
<strong class="figure-label">
<p> Fig. 5. </p>
</strong>
<div class="figure-caption-contents"><p> Potential applications of MBL in a clinical setting. (A) Effect of low light… </p></div>
</div>
<figcaption id="figure-caption-4" class="figure-caption-full figure-caption-text" itemtype="http://schema.org/ImageObject" itemprop="description">
<strong class="figure-label">
Fig. 5.
</strong>
<div class="figure-caption-contents">Potential applications of MBL in a clinical setting. (A) Effect of low light levels on SARS-CoV-2 inactivation using MB. We applied a 10-µL aliquot of SARS-CoV-2 to R3 coupons and dried them for 20 minutes. We added 10 µL of 10 µM MB to each coupon before treatment with 700 lux (the light level produced by the biosafety hood lights) or <100 lux of light. (B) Effect of MB pretreatment on SARS-CoV-2 inactivation. We cut coupons from R3 masks and soaked them for 1 hour in 10 µM MB. We then dried the coupons in the dark for 2 days before adding 10 µL virus to either the inner or outer layers. We exposed the samples to white light (50,000 lux) for 30 minutes and determined the virus titer by plaque assay. (C) Inactivation of a SARS-CoV-2 clinical specimen by MBL. We obtained a saliva specimen from a COVID-19 patient with a titer of 1.1 × 10<sup>5</sup> PFU/mL for SARS-CoV-2. We applied 10 µL aliquots to coupons cut from an R3 mask, treated with 10 µM MB and exposed to white light (50,000 lux) for 30 minutes. We determined virus titer by plaque assay. (D) Effect of MB pretreatment on MHV inactivation using intact masks. We pretreated intact RM and FH masks with 10 µM MB by spraying the front and back with a total of 78 mL MB and allowed them to dry overnight in the dark. We inoculated the dried masks with MHV and exposed them to white light (50,000 lux) for 30 minutes. We then excised inoculated areas before elution and titration. We determined the virus titer by TCID<sub>50</sub> assay. Note. ND, not detected; R3, 3M panel respirator (1870+); RM, 3M 1860 half-sphere respirator; FH, Type IIR Halyard face mask. The dotted line indicates the limit of detection.</div>
</figcaption>
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data-slide-index="5"
data-label-slug="fig-6">
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itemprop="contentUrl"
aria-describedby="figure-caption-5"
role="button"
data-image-width="3600"
data-image-height="2433"
data-image-alt="Fig. 6."
data-pmc-id="PMC8220024"
data-figure-id="f6">
<img class="figure-thumb" itemprop="thumbnail"
id="article-image-5"
src="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/223f/9272543/c22954a4055a/S0899823X21002300_fig6.gif"
alt="Fig. 6." />
</a>
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<div class="figure-caption figure-caption-text" itemtype="http://schema.org/ImageObject" itemprop="caption" aria-hidden="true">
<div class="caption-wrap">
<strong class="figure-label">
<p> Fig. 6. </p>
</strong>
<div class="figure-caption-contents"><p> Effect of MBL and VHP+O… </p></div>
</div>
</div>
<div class="figure-caption-medium figure-caption-text" aria-hidden="true">
<strong class="figure-label">
<p> Fig. 6. </p>
</strong>
<div class="figure-caption-contents"><p> Effect of MBL and VHP+O <sub> 3 </sub> treatments on NaCl submicron filtration efficiencies and… </p></div>
</div>
<figcaption id="figure-caption-5" class="figure-caption-full figure-caption-text" itemtype="http://schema.org/ImageObject" itemprop="description">
<strong class="figure-label">
Fig. 6.
</strong>
<div class="figure-caption-contents">Effect of MBL and VHP+O<sub>3</sub> treatments on NaCl submicron filtration efficiencies and breathability before and after 5 cycles of decontamination. (A) NaCl submicron filtration efficiency is a measure of the ability of an FFR or medical mask to capture aerosolized particles &lt;1 µm, expressed as a percentage of particles that do not pass the material at a given velocity or flow rate. (B) Inhalation and (C) exhalation breathing resistances before and after 5 cycles of decontamination. The resistance to airflow during inhalation and exhalation is an indication of the difficulty in breathing through the respirators and masks. *Results from decontaminated FFRs and medical masks are significantly different from untreated masks (Student <i>t-test</i> or Mann-Whitney U test, <i>P</i> &lt; .01). **Horizontal solid line in (A) represents the N95 filtration efficiency requirement of ≥95% particle filtration efficiency according to 42 CFR Part 84. Horizontal lines in (B) and (C) represent the following breathing resistance standards: inhalation: ≤35 mmH2O; exhalation: ≤25 mmH<sub>2</sub>O for respirators according to 42 CFR Part 84. EN 149 maximum inhalation resistance at 95 L/minute is 2.4 mbar, or ˜24 mmH<sub>2</sub>O. At a higher flow rate according to EN 149, the equivalent breathing resistance may increase slightly but can be similar to the 42 CFR Part 84 maximum inhalation resistance at 85 L/minute. Note. RH, Halyard duckbill respirator (Fluidshield-46727). RM, 3M half-sphere respirator (1860). R3, 3M panel respirator (1870+). FW, EN 14683 Type II generic face mask. FH, ASTM F2100 Level 2 Halyard face mask.</div>
</figcaption>
</figure>
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itemprop="associatedMedia"
data-slide-index="6"
data-label-slug="fig-7">
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itemprop="contentUrl"
aria-describedby="figure-caption-6"
role="button"
data-image-width="780"
data-image-height="967"
data-image-alt="Fig. 7."
data-pmc-id="PMC8220024"
data-figure-id="f7">
<img class="figure-thumb" itemprop="thumbnail"
id="article-image-6"
src="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/223f/9272543/21ebbef92c82/S0899823X21002300_fig7.gif"
alt="Fig. 7." />
</a>
<meta itemprop="width" itemtype="http://schema.org/ImageObject" content="780">
<meta itemprop="height" itemtype="http://schema.org/ImageObject" content="967">
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<div class="caption-wrap">
<strong class="figure-label">
<p> Fig. 7. </p>
</strong>
<div class="figure-caption-contents"><p> Effect of MBL and VHP+O… </p></div>
</div>
</div>
<div class="figure-caption-medium figure-caption-text" aria-hidden="true">
<strong class="figure-label">
<p> Fig. 7. </p>
</strong>
<div class="figure-caption-contents"><p> Effect of MBL and VHP+O <sub> 3 </sub> treatments on human and manikin fit factor… </p></div>
</div>
<figcaption id="figure-caption-6" class="figure-caption-full figure-caption-text" itemtype="http://schema.org/ImageObject" itemprop="description">
<strong class="figure-label">
Fig. 7.
</strong>
<div class="figure-caption-contents">Effect of MBL and VHP+O<sub>3</sub> treatments on human and manikin fit factor of FFRs and medical masks. (A) We performed human fit testing with volunteer participants who adjusted the FFRs and medical masks to achieve the highest fit factor or seal and subsequently performed head movements and remeasured fit or seal. (B) Manikin fit factors using advanced, realistic manikin headforms is a reproducible method to test fit without volunteer participants. We used the PortaCount PRO+ 8038 machine (TSI, Inc, Shoreview, MN) to determine the overall fit for both human participants and manikins headforms. *Indicates significantly different values between treated and untreated FFR or medical mask at <i>P</i> &lt; .05, Student <i>t-test</i> or Mann-Whitney U test, as appropriate. **Horizontal line represents the following standard: Per OSHA 1910.134(f), if the overall fit factor as determined through an OSHA-accepted quantitative fit-testing protocol is ≥100 for tight-fitting half facepieces, then the fittest has been passed for that respirator. Percentages on or above each bar represent % of respirators or masks tested that surpassed this standard. Although the standard does not apply to face masks, we present the % to note the strong difference between respirator and face mask test results. Note. RH, Halyard duckbill respirator (Fluidshield-46727); RM, 3M half-sphere respirator (1860); R3, 3M panel respirator (1870+); FW, EN 14683 Type II generic face mask; FH, ASTM F2100 Level 2 Halyard face mask.</div>
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Rational use of personal protective equipment for coronavirus disease (COVID-19) and considerations during severe shortages. World Health Organization website. <a href="https://www.who.int/publications/i/item/rational-use-of-personal-protective-equipment-for-coronavirus-disease-(covid-19)-and-considerations-during-severe-shortages" rel="noopener nofollow" target="_blank" title="External link: https://www.who.int/publications/i/item/rational-use-of-personal-protective-equipment-for-coronavirus-disease-(covid-19)-and-considerations-during-severe-shortages">https://www.who.int/publications/i/item/rational-use-of-personal-protect...</a>. Published December 23, 2020. Accessed May 3, 2021.
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Richter W, Hofacre K, Willenberg Z. Final Report for the Bioquell hydrogen peroxide vapor (HPV) decontamination for reuse of N95 respirators, Battelle. US Food and Drug Administration website. <a href="https://www.fda.gov/media/136386/download" rel="noopener nofollow" target="_blank" title="External link: https://www.fda.gov/media/136386/download">https://www.fda.gov/media/136386/download</a>. Published 2016. Accessed April 24, 2021.
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