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<article 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" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="review-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Russian Medicine</journal-id><journal-title-group><journal-title xml:lang="en">Russian Medicine</journal-title><trans-title-group xml:lang="ru"><trans-title>Российский медицинский журнал</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0869-2106</issn><issn publication-format="electronic">2412-9100</issn><publisher><publisher-name xml:lang="en">Eco-Vector</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">76380</article-id><article-id pub-id-type="doi">10.17816/0869-2106-2021-27-2-195-200</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Case reports</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Клинический случай</subject></subj-group><subj-group subj-group-type="article-type"><subject>Review Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">A clinical case of the novel coronavirus (COVID-19) reinfection in a health care worker</article-title><trans-title-group xml:lang="ru"><trans-title>Клинический случай повторного заражения новой коронавирусной инфекцией COVID-19 медицинского работника</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-9176-1889</contrib-id><name-alternatives><name xml:lang="en"><surname>Kovtyukh</surname><given-names>Irina V.</given-names></name><name xml:lang="ru"><surname>Ковтюх</surname><given-names>Ирина Владимировна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>ivkovtuh@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-7846-1611</contrib-id><name-alternatives><name xml:lang="en"><surname>Gendlin</surname><given-names>Gennady E.</given-names></name><name xml:lang="ru"><surname>Гендлин</surname><given-names>Геннадий Ефимович</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>MD, Dr. Sci. (Med.), Professor</p></bio><bio xml:lang="ru"><p>д.м.н., профессор</p></bio><email>rgmut2@mail.ru</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-1699-0881</contrib-id><name-alternatives><name xml:lang="en"><surname>Nikitin</surname><given-names>Igor G.</given-names></name><name xml:lang="ru"><surname>Никитин</surname><given-names>Игорь Геннадиевич</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>MD, Dr. Sci. (Med.), Professor</p></bio><bio xml:lang="ru"><p>д.м.н., профессор</p></bio><email>igor.nikitin.65@mail.ru</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kabirova</surname><given-names>Ekaterina V.</given-names></name><name xml:lang="ru"><surname>Кабирова</surname><given-names>Екатерина Вячеславовна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>bazamarsa@mail.ru</email><xref ref-type="aff" rid="aff3"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Markina</surname><given-names>Olga Yu.</given-names></name><name xml:lang="ru"><surname>Маркина</surname><given-names>Ольга Юрьевна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>o.u@gmail.com</email><xref ref-type="aff" rid="aff3"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Federal State Budgetary Institution of Healthcare Central Clinical Hospital of the Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Центральная клиническая больница Российской академии наук</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">N.I. Pirogov Russian National Research Medical University</institution></aff><aff><institution xml:lang="ru">Российский национальный исследовательский медицинский университет имени Н.И. Пирогова</institution></aff></aff-alternatives><aff-alternatives id="aff3"><aff><institution xml:lang="en">City clinical hospital №24</institution></aff><aff><institution xml:lang="ru">Городская клиническая больница № 24 Департамента здравоохранения г. Москвы</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2021-04-15" publication-format="electronic"><day>15</day><month>04</month><year>2021</year></pub-date><volume>27</volume><issue>2</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>195</fpage><lpage>200</lpage><history><date date-type="received" iso-8601-date="2021-07-22"><day>22</day><month>07</month><year>2021</year></date><date date-type="accepted" iso-8601-date="2021-07-22"><day>22</day><month>07</month><year>2021</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2021, Eco-Vector</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2021, ООО "Эко-Вектор"</copyright-statement><copyright-year>2021</copyright-year><copyright-holder xml:lang="en">Eco-Vector</copyright-holder><copyright-holder xml:lang="ru">ООО "Эко-Вектор"</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/" start_date="2024-05-15"/></permissions><self-uri xlink:href="https://medjrf.com/0869-2106/article/view/76380">https://medjrf.com/0869-2106/article/view/76380</self-uri><abstract xml:lang="en"><p>The peculiarities of immune responses to a novel coronavirus infection (COVID-19) and the possibility of reinfection due to the variability of humoral immunity are currently under discussion. This article presents a case of COVID-19 reinfection in a health care worker.</p></abstract><trans-abstract xml:lang="ru"><p>Особенности иммунного ответа после перенесенной новой коронавирусной инфекции COVID-19 и возможность повторного инфицирования ввиду вариабельности формирования гуморального иммунитета являются предметом обсуждения в настоящее время. В статье представлен случай повторного заболевания COVID-19 у медицинского работника.</p></trans-abstract><kwd-group xml:lang="en"><kwd>COVID-19</kwd><kwd>reinfection</kwd><kwd>humoral immunity</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>COVID-19</kwd><kwd>реинфекция</kwd><kwd>гуморальный иммунитет</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><citation-alternatives><mixed-citation xml:lang="en">Roy S. COVID-19 Reinfection: Myth or Truth? SN Compr Clin Med. 2020:1–4. doi: 10.1007/s42399-020-00335-8</mixed-citation><mixed-citation xml:lang="ru">Roy S. 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