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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">sechenov</journal-id><journal-title-group><journal-title xml:lang="en">Sechenov Medical Journal</journal-title><trans-title-group xml:lang="ru"><trans-title>Сеченовский вестник</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2218-7332</issn><issn pub-type="epub">2658-3348</issn><publisher><publisher-name>Сеченовский Университет</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.47093/2218-7332.2022.376.07</article-id><article-id custom-type="elpub" pub-id-type="custom">sechenov-430</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>COVID-19</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>COVID-19</subject></subj-group></article-categories><title-group><article-title>Serosurveillance among healthcare workers vaccinated with ChAdOx1 nCoV-19 Corona vaccine in a tertiary hospital of Kerala, India: prospective cohort studу</article-title><trans-title-group xml:lang="ru"><trans-title>Серологический ответ среди медицинских работников, вакцинированных «ChAdOx1 nCoV-19 Corona» в больнице третичного уровня в Керале, Индия: проспективное когортное исследование</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-4084-6268</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Нджареккаттувалаппил</surname><given-names>С. К.</given-names></name><name name-style="western" xml:lang="en"><surname>Njarekkattuvalappil</surname><given-names>S. K.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Свати К. Нджареккаттувалаппил, MBBS, MD, ассистент кафедры общественной медицины </p><p>Триссур-680005, Керала</p></bio><bio xml:lang="en"><p>Swathi K. Njarekkattuvalappil, MBBS, MD, Assistant Professor, Department of Community Medicine </p><p>Thrissur-680005, Kerala</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-4106-1745</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Бхаскаран</surname><given-names>Р.</given-names></name><name name-style="western" xml:lang="en"><surname>Bhaskaran</surname><given-names>R.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Рамеш Бхаскаран, MBBS, MD, профессор кафедры трансфузионной медицины </p><p>Триссур-680005, Керала </p></bio><bio xml:lang="en"><p>Ramesh Bhaskaran, MBBS, MD, Professor, Department of Transfusion Medicine </p><p>Thrissur-680005, Kerala</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-5371-489X</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Шри Радж</surname><given-names>В.</given-names></name><name name-style="western" xml:lang="en"><surname>Sree Raj</surname><given-names>V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Шри Радж В., MBBS, MD, младший резидент кафедры трансфузионной медицины </p><p>Триссур-680005, Керала</p></bio><bio xml:lang="en"><p>Sree Raj V., MBBS, MD, Junior Resident, Department of Transfusion Medicine </p><p>Thrissur-680005, Kerala</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-7901-1196</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Хосе</surname><given-names>П.</given-names></name><name name-style="western" xml:lang="en"><surname>Jose</surname><given-names>P.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Понну Хосе, MBBS, MD, ассистент кафедры общественной медицины </p><p>Триссур-680005, Керала</p></bio><bio xml:lang="en"><p>Ponnu Jose, MBBS, MD, Assistant Professor, Department of Community Medicine </p><p>Thrissur-680005, Kerala</p></bio><email xlink:type="simple">ponnu034@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-3885-7822</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Рафи</surname><given-names>А. М.</given-names></name><name name-style="western" xml:lang="en"><surname>Rafi</surname><given-names>Aboobacker M.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Абубакер М. Рафи, MBBS, MD, доцент кафедры трансфузионной медицины </p><p>Триссур-680005, Керала</p></bio><bio xml:lang="en"><p>Aboobacker M. Rafi, MBBS, MD, Assistant Professor, Department of Transfusion Medicine </p><p>Thrissur-680005, Kerala</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-5611-7548</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Томас</surname><given-names>Д.</given-names></name><name name-style="western" xml:lang="en"><surname>Thomas</surname><given-names>J.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Джо Томас, MBBS, MD, профессор кафедры общественной медицины </p><p>Триссур-680005, Керала</p></bio><bio xml:lang="en"><p>Joe Thomas, MBBS, MD, Professor, Department of Community Medicine </p><p>Thrissur-680005, Kerala</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-9954-2499</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Инна</surname><given-names>С. Дж.</given-names></name><name name-style="western" xml:lang="en"><surname>Innah</surname><given-names>S. J.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Сушила Дж. Инна, MBBS, MD, профессор кафедры трансфузионной медицины </p><p>Триссур-680005, Керала</p></bio><bio xml:lang="en"><p>Susheela J. Innah, MBBS, MD, Professor, Department of Transfusion Medicine </p><p>Thrissur-680005, Kerala</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-4612-205X</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Рафаэль</surname><given-names>Л.</given-names></name><name name-style="western" xml:lang="en"><surname>Raphael</surname><given-names>L.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Люси Рафаэль, MBBS, MD, профессор кафедры общественной медицины </p><p>Триссур-680005, Керала</p></bio><bio xml:lang="en"><p>Lucy Raphael, MBBS, MD, Professor, Department of Community Medicine </p><p>Thrissur-680005, Kerala</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-8161-3746</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Унникришнан</surname><given-names>У. Г.</given-names></name><name name-style="western" xml:lang="en"><surname>Unnikrishnan</surname><given-names>U. G.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Уттумадатил Г. Унникришнан, MSc, статистик кафедры общественной медицины</p><p>Триссур-680005, Керала</p></bio><bio xml:lang="en"><p>Uttumadathil G. Unnikrishnan, MSc, Statistician, Department of Community Medicine </p><p>Thrissur-680005, Kerala</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-9877-2521</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Раджмохан</surname><given-names>П.</given-names></name><name name-style="western" xml:lang="en"><surname>Rajmohan</surname><given-names>P.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Приянка Раджмохан, MBBS, MD, доцент кафедры общественной медицины </p><p>Триссур-680005, Керала</p></bio><bio xml:lang="en"><p>Priyanka Rajmohan, MBBS, MD, Associate Professor, Department of Community Medicine </p><p>Thrissur-680005, Kerala</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-1302-9091</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Валсан</surname><given-names>Ч.</given-names></name><name name-style="western" xml:lang="en"><surname>Valsan</surname><given-names>Ch.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Читра Валсан, MBBS, MD, профессор кафедры микробиологии </p><p>Триссур-680005, Керала</p></bio><bio xml:lang="en"><p>Chithra Valsan, MBBS, MD, Professor, Department of Microbiology </p><p>Thrissur-680005, Kerala</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-5569-2193</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Куттичира</surname><given-names>П.</given-names></name><name name-style="western" xml:lang="en"><surname>Kuttichira</surname><given-names>P.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Правенлал Куттичира, MBBS, MD, руководитель &amp; профессор психиатрии </p><p>Триссур-680005, Керала</p></bio><bio xml:lang="en"><p>Praveenlal Kuttichira, MBBS, MD, Principal &amp; Professor of Psychiatry </p><p>Thrissur-680005, Kerala</p></bio><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Медицинский колледж и исследовательский институт Jubilee Mission</institution><country>Индия</country></aff><aff xml:lang="en"><institution>Jubilee Mission Medical College and Research Institute</institution><country>India</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2022</year></pub-date><pub-date pub-type="epub"><day>25</day><month>10</month><year>2021</year></pub-date><volume>13</volume><issue>1</issue><fpage>14</fpage><lpage>23</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Njarekkattuvalappil S.K., Bhaskaran R., Sree Raj V., Jose P., Rafi A.M., Thomas J., Innah S.J., Raphael L., Unnikrishnan U.G., Rajmohan P., Valsan C., Kuttichira P., 2021</copyright-statement><copyright-year>2021</copyright-year><copyright-holder xml:lang="ru">Нджареккаттувалаппил С.К., Бхаскаран Р., Шри Радж В., Хосе П., Рафи А.М., Томас Д., Инна С.Д., Рафаэль Л., Унникришнан У.Г., Раджмохан П., Валсан Ч., Куттичира П.</copyright-holder><copyright-holder xml:lang="en">Njarekkattuvalappil S.K., Bhaskaran R., Sree Raj V., Jose P., Rafi A.M., Thomas J., Innah S.J., Raphael L., Unnikrishnan U.G., Rajmohan P., Valsan C., Kuttichira P.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://www.sechenovmedj.com/jour/article/view/430">https://www.sechenovmedj.com/jour/article/view/430</self-uri><abstract><sec><title>Aim</title><p>Aim. To evaluate antibody responses following two doses of ChAdOx1 nCoV-19 Corona vaccination in a tertiary care setting and the association of host factors like age, body mass index and comorbidities in determining this antibody response.</p></sec><sec><title>Materials and methods</title><p>Materials and methods. This prospective serosurveillance study was done among healthcare workers of Jubilee Mission Medical College, vaccinated during January- April 2021. Blood samples were drawn from 170 participants after their first dose and from 156 participants after their second dose of CovishieldTM to measure the specific Ig G antibodies against the recombinant S1 subunit of the S protein of SARS-CoV-2.</p></sec><sec><title>Results</title><p>Results. The median level of anti-SARS-CoV-2 Ig G antibody 28–56 days after the first dose vaccination was 3.64 S/C (1.33, 7.24) and 11.6 S/C (8.61, 14.27) after 14 days of second dose vaccination. Protective levels of anti-SARS CoV-2 Ig G antibodies (≥ 9.5 S/C) was developed by 25 participants (14.7%, 95% confidence interval: 9.8% to 20.9%) after 28–56 days of first dose of vaccination and by 109 participants (69.9%, 95% confidence interval: 62% to 77%) after 14 days of second dose. Health care workers in the age group below 60 years (p = 0.027) and without comorbidities (p = 0.079) showed higher protective Ig G levels. But on multiple logistic regression only age under 60 years was found to be statistically significant.</p></sec><sec><title>Conclusion</title><p>Conclusion. After the first dose of the ChAdOx1 nCoV-19 vaccine, the formation of Ig G antibodies was observed, the level of which increased after the second dose. Among the various associated factors studied only the age of the participants below 60 years was found to be statistically significant for protective antibody levels. Follow up studies involving larger and different ethnic population is key to decoding the antibody response especially in the elderly and high-risk groups.</p></sec></abstract><trans-abstract xml:lang="ru"><sec><title>Цель</title><p>Цель. Оценить гуморальный ответ после введения двух доз вакцины «ChAdOx1 nCoV-19 Corona» в учреждении третичного звена здравоохранения и оценить взаимосвязь факторов хозяина, таких как возраст, индекс массы тела и сопутствующие заболевания, с уровнем антител.</p></sec><sec><title>Материалы и методы</title><p>Материалы и методы. Проспективное исследование было проведено среди медицинских работников Медицинского колледжа Jubilee Mission, вакцинированных в период с января по апрель 2021 года. Образцы крови для определения специфических антител IgG против рекомбинантной субъединицы S1 белка S SARS-CoV-2 были взяты у 170 участников после первой дозы и у 156 участников после второй дозы CovisieldTM.</p></sec><sec><title>Результаты</title><p> Результаты. Медиана уровня антител IgG к SARS-CoV-2 через 28–56 дней после введения первой дозы составляет 3,64 S/C (1,33, 7,24) и через 14 дней после второй – 11,6 S/C (8,61, 14,27). Протективные уровни антител IgG против SARS CoV-2 (≥ 9,5 S/C) достигнуты у 25 участников (14,7%, 95% доверительный интервал: от 9,8 до 20,9%) через 28–56 дней после введения первой дозы вакцины и 109 участников (69,9%, 95% доверительный интервал: от 62 до 77%) через 14 дней после второй дозы. У медицинских работников моложе 60 лет (р = 0,027) и без сопутствующих заболеваний (р = 0,079) выявлен более высокий уровень защитных IgG. Но при множественной логистической регрессии статистически значимым оказался только возраст до 60 лет.</p></sec><sec><title>Заключение</title><p>Заключение. После введения первой дозы вакцины «ChAdOx1 nCoV-19» наблюдается образование антител IgG, уровень которых повышается после введения второй дозы. Среди изученных факторов только возраст участников моложе 60 лет оказался статистически значимым для достижения протективного уровня антител. Последующие исследования с участием более крупного и разнообразного этнического населения являются ключом к расшифровке ответа антител, особенно у пожилых людей и групп высокого риска.</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>гуморальный ответ</kwd><kwd>вакцина ChAdOx1 nCoV-19</kwd><kwd>медицинские работники</kwd><kwd>нейтрализующие антитела</kwd><kwd>защитный уровень</kwd><kwd>SARS-CoV-2</kwd></kwd-group><kwd-group xml:lang="en"><kwd>antibody response</kwd><kwd>ChAdOx1COVID-19 vaccine</kwd><kwd>health care workers</kwd><kwd>neutralizing antibodies</kwd><kwd>protective level</kwd><kwd>SARS-CoV-2</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Fortner A., Schumacher D. 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