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<h2 class="element-invisible">You are here</h2><div class="breadcrumb"><a href="/">Home</a> » <a href="/news-events">News & Events</a> » <a href="/news-events/nih-research-matters">NIH Research Matters</a></div> <div class="l-region l-region--section-header">
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<p class="publishdate"><span property="dc:date" datatype="xsd:dateTime" content="2021-12-07T00:00:00-05:00" class="date-display-single">December 7, 2021</span></p><div class='syndicate'><h1>Measuring protection after COVID-19 vaccination</h1><div class="callout callout-with-border"><h3>At a Glance</h3>
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<li>In people who received two doses of the Moderna COVID-19 vaccine, levels of antibodies found in the blood correlated with protection against illness.</li>
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<li>The findings show that measurement of certain antibody levels could allow for smaller, faster studies of vaccines against COVID-19 variants.</li>
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</ul></div><div class="media-float-right"><div class="ds-1col file file-image file-image-jpeg view-mode-floated_media clearfix">
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<picture title="Woman getting vaccination in clinic.">
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<!--[if IE 9]><video style="display: none;"><![endif]-->
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-large/public/news-events/research-matters/2021/20211207-%20vaccine.jpg?itok=f99P_uYI&timestamp=1638814913 1x" media="screen and (min-width: 960px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-medium/public/news-events/research-matters/2021/20211207-%20vaccine.jpg?itok=r1kL7mGl&timestamp=1638814913 1x" media="screen and (min-width: 800px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-medium-small/public/news-events/research-matters/2021/20211207-%20vaccine.jpg?itok=i82CRfOA&timestamp=1638814913 1x" media="screen and (min-width: 600px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-small/public/news-events/research-matters/2021/20211207-%20vaccine.jpg?itok=mTH_PtfA&timestamp=1638814913 1x" media="screen and (min-width: 480px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-tiny/public/news-events/research-matters/2021/20211207-%20vaccine.jpg?itok=y54gqgx9&timestamp=1638814913 1x" media="screen and (min-width: 0)" />
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<!--[if IE 9]></video><![endif]-->
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<img src="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-medium/public/news-events/research-matters/2021/20211207-%20vaccine.jpg?itok=r1kL7mGl&timestamp=1638814913" alt="Woman getting vaccination in clinic." title="Woman getting vaccination in clinic." />
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</picture><span class="caption">Researchers have been looking for immune markers that could help streamline future COVID-19 vaccine trials.</span><span class="credit">MIA Studio / Shutterstock</span></div>
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</div><p>Vaccines against SARS-CoV-2, the virus that causes COVID-19, were produced, tested, and approved in record time. The clinical trials assessing the safety and effectiveness of these vaccines required tens of thousands of volunteers.</p>
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<p>With the continued emergence of new SARS-CoV-2 variants, and the possibility that COVID-19 vaccines might need to be modified in response, researchers are seeking ways to streamline vaccine trials. Markers of immune response that could predict the protection conferred by vaccination would allow for clinical trials that use fewer volunteers.</p>
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<p>Toward this end, researchers led by Dr. Peter Gilbert from the Fred Hutchinson Cancer Research Center measured antibodies in the blood of more than 1,000 people who had received the two-dose Moderna COVID-19 vaccine. The team measured binding antibodies, which bind viruses to tag them for destruction, and neutralizing antibodies, which stop viruses from infecting cells by blocking the parts they need to enter.</p>
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<p>The researchers looked for associations between levels of antibodies post-vaccination and the risk of symptomatic COVID-19 infections. The study was funded in part by NIH’s National Institute of Allergy and Infectious Diseases (NIAID) and Office of the Director (OD). Results were published on November 23, 2021, in <em>Science</em>.</p>
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||
<p>Antibodies were measured in blood samples taken 4 weeks after the first and second vaccine doses. Levels of both binding and neutralizing antibodies were lower in people who later developed COVID-19 than in people who didn’t get sick. The protection conferred by the vaccine increased as levels of these antibodies increased.</p>
|
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||
<p>For example, for people with no detectible neutralizing antibodies, the vaccine was only 51% effective. For people with the highest levels, it was 98% effective. Based on any of the measures, the risk of COVID-19 was about 10 times lower for people with the top 10% of antibody levels compared to those with the lowest levels.</p>
|
||
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||
<p>Binding and neutralizing antibodies had similar associations with vaccine effectiveness. The team also looked at blood samples from two other studies: a clinical trial of the Oxford/AstraZeneca vaccine in the U.K. and non-human primate studies of the Moderna vaccine. They saw similar correlations between levels of neutralizing antibodies and vaccine effectiveness in both studies.</p>
|
||
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||
<p>These antibody tests, or assays, have the potential to allow smaller and quicker trials. However, Gilbert points out, “It remains crucial that we also follow up any provisional decisions based on such assays with direct verification.”</p>
|
||
|
||
<p>It’s not yet known if these short-term antibody measures correlate with long-term protection. Other parts of the immune response help protect against viruses as well. The study also did not look at antibodies after a booster dose. The participants will be followed for a total of two years to gain more insights.</p>
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<p>—by Sharon Reynolds</p></div><h2 class="label-above">Related Links</h2><ul class="spaced print-urls"><li><a href="https://www.nih.gov/news-events/nih-research-matters/moderna-covid-19-booster-may-protect-against-variants" target="_top">Moderna COVID-19 Booster May Protect Against Variants</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/understanding-sars-cov-2-antibody-binding" target="_top">Understanding SARS-CoV-2 Antibody Binding</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/moderna-covid-19-vaccine-generates-long-lasting-immune-memory" target="_top">Moderna COVID-19 Vaccine Generates Long-Lasting Immune Memory</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/vaccines-prevented-140000-covid-19-deaths-us" target="_top">Vaccines Prevented up to 140,000 COVID-19 Deaths in U.S.</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/intranasal-covid-19-vaccine-effective-animal-studies" target="_top">Intranasal COVID-19 Vaccine Effective in Animal Studies</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/immune-response-vaccination-after-covid-19" target="_top">Immune Response to Vaccination After COVID-19</a></li><li><a href="https://covid19.nih.gov/" target="_top">Coronavirus (COVID-19)</a></li><li><a href="https://www.coronaviruspreventionnetwork.org/" target="_top">Coronavirus Prevention Network</a></li><li><a href="https://www.coronavirus.gov/" target="_top">Coronavirus (COVID-19) (CDC)</a></li></ul><p class="footnote"><strong class="label-inline">References: </strong><a href="https://pubmed.ncbi.nlm.nih.gov/34812653/">Immune correlates analysis of the mRNA-1273 COVID-19 vaccine efficacy clinical trial.</a> Gilbert PB, Montefiori DC, McDermott AB, Fong Y, Benkeser D, Deng W, Zhou H, Houchens CR, Martins K, Jayashankar L, Castellino F, Flach B, Lin BC, O'Connell S, McDanal C, Eaton A, Sarzotti-Kelsoe M, Lu Y, Yu C, Borate B, van der Laan LWP, Hejazi NS, Huynh C, Miller J, El Sahly HM, Baden LR, Baron M, De La Cruz L, Gay C, Kalams S, Kelley CF, Andrasik MP, Kublin JG, Corey L, Neuzil KM, Carpp LN, Pajon R, Follmann D, Donis RO, Koup RA; Immune Assays Team; Moderna, Inc. Team; Coronavirus Vaccine Prevention Network (CoVPN)/Coronavirus Efficacy (COVE) Team; United States Government (USG)/CoVPN Biostatistics Team. <em>Science</em>. 2021 Nov 23:eab3435. Online ahead of print. PMID: 34812653.</p><p class="footnote"><strong class="label-inline">Funding: </strong>NIH’s National Institute of Allergy and Infectious Diseases (NIAID) and Office of the Director (OD); Moderna, Inc.; Biomedical Advanced Research and Development Authority.</p>
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