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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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<div about="/news-events/nih-research-matters/misdirected-antibodies-linked-severe-covid-19" typeof="sioc:Item foaf:Document" class="ds-1col node node--nih-research-matters view-mode-full node--full node--nih-research-matters--full clearfix">
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<p class="publishdate"><span property="dc:date" datatype="xsd:dateTime" content="2021-09-14T00:00:00-04:00" class="date-display-single">September 14, 2021</span></p><div class='syndicate'><h1>Misdirected antibodies linked to severe COVID-19</h1><div class="callout callout-with-border"><h3>At a Glance</h3>
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<ul>
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<li>Antibodies that mistakenly target the body’s own immune-system proteins may account for about 20% of COVID-19 deaths.</li>
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<li>Tests for these misdirected antibodies could help identify people in need of aggressive early treatment or preventive measures.</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="Patient in an intensive care unit">
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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/2021/20210914-covid.jpg?itok=B1LIxtyP&timestamp=1631637722 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/2021/20210914-covid.jpg?itok=ij0-aNfj&timestamp=1631637722 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/2021/20210914-covid.jpg?itok=nBqE6qPt&timestamp=1631637722 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/2021/20210914-covid.jpg?itok=YdYTxi5S&timestamp=1631637722 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/2021/20210914-covid.jpg?itok=gr02EHDY&timestamp=1631637722 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/2021/20210914-covid.jpg?itok=ij0-aNfj&timestamp=1631637722" alt="Patient in an intensive care unit" title="Patient in an intensive care unit" />
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</picture><span class="caption">Researchers are learning why some people are barely affected by SARS-CoV-2 while others end up needing intensive care or dying.</span><span class="credit">Alexandros Michailidis / Shutterstock.com</span></div>
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</div><p>The severity of COVID-19 can differ drastically between individuals. Some people never know they’ve been infected, while others may end up needing intensive care or dying from the disease.</p>
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<p>Several factors have been associated with severe COVID-19, including preexisting health conditions like obesity, diabetes, and high blood pressure. Men are more likely to die of the disease than women. And the risk of dying from COVID-19 increases with age.</p>
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<p>Researchers around the world have been looking for other risk factors for severe or fatal infection with SARS-CoV-2, the virus that causes COVID-19. An international project called the COVID Human Genetic Effort has been searching for genetic and molecular differences that may increase the risk of severe COVID-19. The project is co-directed by Dr. Helen Su from NIH’s National Institute of Allergy and Infectious Diseases (NIAID) and Dr. Jean-Laurent Casanova from Rockefeller University.</p>
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||
<p>Two recent studies from the project, led by Casanova, found that some severe cases of COVID-19 could be linked to problems with immune-system proteins called type I interferons (IFNs). These IFNs are needed to fight off viral infections. In rare cases, genetic conditions blocked the production of these proteins. But more commonly, antibodies that mistakenly targeted the IFNs were found in the blood of people with severe or fatal COVID-19.</p>
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<p>To better understand how common these autoantibodies are, Casanova and his colleagues screened for them in blood samples taken from more than 3,500 people with severe or fatal COVID-19 and more than 34,000 uninfected volunteers from 38 different countries. The new study was funded in part by several NIH components, primarily NIAID. Results were published on August 19, 2021, in <em>Science Immunology</em>.</p>
|
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|
||
<p>The team found that 20% of people hospitalized with severe COVID-19 had high or intermediate levels of autoantibodies to type I IFNs. Autoantibodies were also found in at least 18% of people who died from the disease. In contrast, people with no or mild symptoms had very low levels of these autoantibodies. The researchers estimate that the autoantibodies may account for about 20% of total fatal COVID-19 cases.</p>
|
||
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||
<p>The risk of having such autoantibodies increased with age. For example, while fewer than 10% of people under the age of 40 with severe COVID-19 had active levels of these autoantibodies, more than 21% of those over the age of 80 had them.</p>
|
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|
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<p>The researchers also found evidence of autoantibody production in uninfected volunteers. They were found in less than 1% of people between 18 and 69 years; in 2.3% of those between 70 and 79 years; and in 6.3% of those 80 years and older. This suggests that type I IFN autoantibodies existed before infection and become more common past age 70.</p>
|
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||
<p>In a related paper published in the same issue of <em>Science Immunology</em>, the researchers identified another rare genetic defect that occurs only in men and results in disruption of IFN production. They estimated that this genetic risk factor accounts for at least 1% of cases of life-threatening COVID-19 in men under the age of 60.</p>
|
||
|
||
<p>“We can neatly explain much of severe COVID-19 as a net defect in type I IFN,” Casanova says. “To an extent never seen for any other acute infectious disease, these… studies collectively provide a molecular and immunological explanation for about 20% of critical cases.”</p>
|
||
|
||
<p>Autoantibodies against IFNs—at even very low levels—can be screened for in the clinic. Testing for these autoantibodies could help identify uninfected people who need aggressive preventive measures or infected people who need early aggressive treatment.</p>
|
||
|
||
<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/early-treatment-convalescent-plasma-covid-19-doesnt-show-benefit" target="_top">Early Treatment with Convalescent Plasma for COVID-19 Doesn’t Show Benefit</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/how-covid-19-variants-evade-immune-response" target="_top">How COVID-19 Variants Evade Immune Response</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/most-covid-19-hospitalizations-due-four-conditions" target="_top">Most COVID-19 Hospitalizations Due to Four Conditions</a></li><li><a href="https://www.niaid.nih.gov/news-events/scientists-discover-genetic-and-immunologic-underpinnings-some-cases-severe-covid-19" target="_top">Scientists Discover Genetic and Immunologic Underpinnings of Some Cases of Severe COVID-19</a></li><li><a href="https://newsinhealth.nih.gov/2021/03/understanding-covid-19" target="_top">Understanding COVID-19: How To Protect Yourself During the Pandemic</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/34413139/">Autoantibodies neutralizing type I IFNs are present in <strong>~</strong>4% of uninfected individuals over 70 years old and account for <strong>~</strong>20% of COVID-19 deaths.</a> Bastard P, Gervais A, Le Voyer T, Rosain J, Philippot Q, Manry J, Michailidis E, Hoffmann HH, Eto S, Garcia-Prat M, Bizien L, Parra-Martínez A, Yang R, Haljasmägi L, Migaud M, Särekannu K, Maslovskaja J, de Prost N, Tandjaoui-Lambiotte Y, Luyt CE, Amador-Borrero B, Gaudet A, Poissy J, Morel P, Richard P, Cognasse F, Troya J, Trouillet-Assant S, Belot A, Saker K, Garçon P, Rivière JG, Lagier JC, Gentile S, Rosen LB, Shaw E, Morio T, Tanaka J, Dalmau D, Tharaux PL, Sene D, Stepanian A, Megarbane B, Triantafyllia V, Fekkar A, Heath JR, Franco JL, Anaya JM, Solé-Violán J, Imberti L, Biondi A, Bonfanti P, Castagnoli R, Delmonte OM, Zhang Y, Snow AL, Holland SM, Biggs C, Moncada-Vélez M, Arias AA, Lorenzo L, Boucherit S, Coulibaly B, Anglicheau D, Planas AM, Haerynck F, Duvlis S, Nussbaum RL, Ozcelik T, Keles S, Bousfiha AA, El Bakkouri J, Ramirez-Santana C, Paul S, Pan-Hammarström Q, Hammarström L, Dupont A, Kurolap A, Metz CN, Aiuti A, Casari G, Lampasona V, Ciceri F, Barreiros LA, Dominguez-Garrido E, Vidigal M, Zatz M, van de Beek D, Sahanic S, Tancevski I, Stepanovskyy Y, Boyarchuk O, Nukui Y, Tsumura M, Vidaur L, Tangye SG, Burrel S, Duffy D, Quintana-Murci L, Klocperk A, Kann NY, Shcherbina A, Lau YL, Leung D, Coulongeat M, Marlet J, Koning R, Reyes LF, Chauvineau-Grenier A, Venet F, Monneret G, Nussenzweig MC, Arrestier R, Boudhabhay I, Baris-Feldman H, Hagin D, Wauters J, Meyts I, Dyer AH, Kennelly SP, Bourke NM, Halwani R, Sharif-Askari NS, Dorgham K, Sallette J, Sedkaoui SM, AlKhater S, Rigo-Bonnin R, Morandeira F, Roussel L, Vinh DC, Ostrowski SR, Condino-Neto A, Prando C, Bonradenko A, Spaan AN, Gilardin L, Fellay J, Lyonnet S, Bilguvar K, Lifton RP, Mane S; HGID Lab; COVID Clinicians; COVID-STORM Clinicians; NIAID Immune Response to COVID Group; NH-COVAIR Study Group; Danish CHGE; Danish Blood Donor Study; St. James's Hospital; SARS CoV2 Interest group; French COVID Cohort Study Group; Imagine COVID-Group; Milieu Intérieur Consortium; CoV-Contact Cohort; Amsterdam UMC Covid-19; Biobank Investigators; COVID Human Genetic Effort; CONSTANCES cohort; 3C-Dijon Study; Cerba Health-Care; Etablissement du Sang study group, Anderson MS, Boisson B, Béziat V, Zhang SY, Vandreakos E, Hermine O, Pujol A, Peterson P, Mogensen TH, Rowen L, Mond J, Debette S, de Lamballerie X, Duval X, Mentré F, Zins M, Soler-Palacin P, Colobran R, Gorochov G, Solanich X, Susen S, Martinez-Picado J, Raoult D, Vasse M, Gregersen PK, Piemonti L, Rodríguez-Gallego C, Notarangelo LD, Su HC, Kisand K, Okada S, Puel A, Jouanguy E, Rice CM, Tiberghien P, Zhang Q, Cobat A, Abel L, Casanova JL. <em>Sci Immunol</em>. 2021 Aug 19;6(62):eabl4340. doi: 10.1126/sciimmunol.abl4340. PMID: 34413139.
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<br /><a href="https://pubmed.ncbi.nlm.nih.gov/34413140/">X-linked recessive TLR7 deficiency in ~1% of men under 60 years old with life-threatening COVID-19.</a> Asano T, Boisson B, Onodi F, Matuozzo D, Moncada-Velez M, Maglorius Renkilaraj MRL, Zhang P, Meertens L, Bolze A, Materna M, Korniotis S, Gervais A, Talouarn E, Bigio B, Seeleuthner Y, Bilguvar K, Zhang Y, Neehus AL, Ogishi M, Pelham SJ, Le Voyer T, Rosain J, Philippot Q, Soler-Palacín P, Colobran R, Martin-Nalda A, Rivière JG, Tandjaoui-Lambiotte Y, Chaïbi K, Shahrooei M, Darazam IA, Olyaei NA, Mansouri D, Hatipoğlu N, Palabiyik F, Ozcelik T, Novelli G, Novelli A, Casari G, Aiuti A, Carrera P, Bondesan S, Barzaghi F, Rovere-Querini P, Tresoldi C, Franco JL, Rojas J, Reyes LF, Bustos IG, Arias AA, Morelle G, Christèle K, Troya J, Planas-Serra L, Schlüter A, Gut M, Pujol A, Allende LM, Rodriguez-Gallego C, Flores C, Cabrera-Marante O, Pleguezuelo DE, de Diego RP, Keles S, Aytekin G, Akcan OM, Bryceson YT, Bergman P, Brodin P, Smole D, Smith CIE, Norlin AC, Campbell TM, Covill LE, Hammarström L, Pan-Hammarström Q, Abolhassani H, Mane S, Marr N, Ata M, Al Ali F, Khan T, Spaan AN, Dalgard CL, Bonfanti P, Biondi A, Tubiana S, Burdet C, Nussbaum R, Kahn-Kirby A, Snow AL; COVID Human Genetic Effort; COVID-STORM Clinicians; COVID Clinicians; Imagine COVID Group; French COVID Cohort Study Group; CoV-Contact Cohort; Amsterdam UMC Covid-; Biobank; NIAID-USUHS COVID Study Group, Bustamante J, Puel A, Boisson-Dupuis S, Zhang SY, Béziat V, Lifton RP, Bastard P, Notarangelo LD, Abel L, Su HC, Jouanguy E, Amara A, Soumelis V, Cobat A, Zhang Q, Casanova JL. <em>Sci Immunol</em>. 2021 Aug 19;6(62):eabl4348. doi: 10.1126/sciimmunol.abl4348. PMID: 34413140.</p><p class="footnote"><strong class="label-inline">Funding: </strong>NIH’s National Institute of Allergy and Infectious Diseases (NIAID), National Center for Advancing Translational Sciences (NCATS), National Human Genome Research Institute (NHGRI), National Institute of Dental and Craniofacial Research (NIDCR), National Cancer Institute (NCI), and Office of the Director (OD); Howard Hughes Medical Institute; Rockefeller University; St. Giles Foundation; Emergent Ventures; George Mason University; Fisher Center for Alzheimer’s Research Foundation; Meyer Foundation; JPB Foundation; French National Research Agency; European Union; Square Foundation; Grandir - Fonds de solidarité pour l’enfance; Fondation du Souffle; SCOR Corporate Foundation for Science; Institut National de la Santé et de la Recherche Médicale (INSERM); University of Paris; French Foundation for Medical Research; Imagine Institute; G. Harold and Leila Y. Mathers Charitable Foundation; REACTing Consortium; French Ministry of Health; European Commission; Estonian Research Council; Al Jalila Foundation; University of Sharjah; Regione Lombardia, Italy; Instituto de Salud Carlos III; Biomedical Advanced Research and Development Authority; Japan Agency for Medical Research and Development; Sorbonne University; Victor Segalen–Bordeaux II University; Sanofi-Aventis; Mutuelle Générale de l’Education Nationale; Institut de la Longévité; Conseils Régionaux of Aquitaine and Bourgogne; Fondation de France; University of Bordeaux; FWO Fundamental Clinical Mandate; YoMeCorono; European Regional Development Fund; Spanish Ministry of Science and Innovation; Grupo DISA; Cabildo Insular de Tenerife; Michael Smith Foundation for Health Research; Society for the Relief of Disabled Children; Croucher Foundation; Coopération Scientifique France-Colciencias; Czech Health Research Council and Ministry of Health; OSR-UniSR and Ministero della Salute; CSL Behring; KU Leuven; VIB GC PID Grant; FWO Grants; Jeffrey Model Foundation; Hellenic Foundation for Research and Innovation; Sao Paulo Research Foundation; Meath Foundation; Regione Lazio; Italian Ministry of Health; Mercatus Center; Bettencourt Schueller Foundation.</p>
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