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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="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">actabiomedica</journal-id><journal-title-group><journal-title xml:lang="ru">Acta Biomedica Scientifica</journal-title><trans-title-group xml:lang="en"><trans-title>Acta Biomedica Scientifica</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2541-9420</issn><issn pub-type="epub">2587-9596</issn><publisher><publisher-name>Scientific Centre for Family Health and Human Reproduction Problems</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.29413/ABS.2021-6.5.25</article-id><article-id custom-type="elpub" pub-id-type="custom">actabiomedica-3060</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="ru"><subject>ЭПИДЕМИОЛОГИЯ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>EPIDEMIOLOGY</subject></subj-group></article-categories><title-group><article-title>Популяционный иммунитет населения южных регионов Дальнего Востока России к SARS-COV-2</article-title><trans-title-group xml:lang="en"><trans-title>Herd immunity to SARS-COV-2 in the population of the Southern regions of the Far East of Russia</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-2567-9032</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Попова</surname><given-names>А. Ю.</given-names></name><name name-style="western" xml:lang="en"><surname>Popova</surname><given-names>A. Yu.</given-names></name></name-alternatives><bio xml:lang="ru"><p>доктор медицинских наук, профессор, руководитель, </p><p>127994, г. Москва, Вадковский пер., 18, стр. 5, 7</p></bio><bio xml:lang="en"><p>Dr. Sc. (Med.), Professor, Head, </p><p>Vadkovsky lane 18, build. 5, 7, Moscow 127994</p></bio><email xlink:type="simple">depart@gsen.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-2723-1496</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Смирнов</surname><given-names>В. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Smirnov</surname><given-names>V. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>доктор медицинских наук, профессор, ведущий научный сотрудник отдела молекулярной эпидемиологии, </p><p>197101, г. Санкт-Петербург, ул. Мира, 14</p></bio><bio xml:lang="en"><p>Dr. Sc. (Med.), Professor, Leading Research Officer at the Department of Molecular Epidemiology,</p><p>Mira str. 14, Saint Petersburg 197101</p></bio><email xlink:type="simple">vssmi@mail.ru</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-8701-280X</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Ежлова</surname><given-names>Е. Б.</given-names></name><name name-style="western" xml:lang="en"><surname>Ezhlova</surname><given-names>E. B.</given-names></name></name-alternatives><bio xml:lang="ru"><p>кандидат медицинских наук, заместитель руководителя, </p><p>127994, г. Москва, Вадковский пер., 18, стр. 5, 7</p></bio><bio xml:lang="en"><p>Cand. Sc, (Med.), Deputy Head, </p><p>Vadkovsky lane 18, build. 5, 7, Moscow 127994</p></bio><email xlink:type="simple">ezhlova_eb@rospotrebnadzor.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-5651-1331</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Мельникова</surname><given-names>А. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Melnikova</surname><given-names>A. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>кандидат медицинских наук, заместитель начальника управления эпидемиологического надзора, </p><p>127994, г. Москва, Вадковский пер., 18, стр. 5, 7</p></bio><bio xml:lang="en"><p>Cand. Sc. (Med.), Deputy Head of the Epidemiological Surveillance Department,</p><p>Vadkovsky lane 18, build. 5, 7, Moscow 127994</p></bio><email xlink:type="simple">melnikova_aa@rospotrebnadzor.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-3050-4472</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Троценко</surname><given-names>О. Е.</given-names></name><name name-style="western" xml:lang="en"><surname>Trotsenko</surname><given-names>O. E.</given-names></name></name-alternatives><bio xml:lang="ru"><p>доктор медицинских наук, директор, </p><p>680000, г. Хабаровск, ул. Шевченко, 2</p></bio><bio xml:lang="en"><p>Dr. Sc. (Med.), Director, </p><p>Shevchenko str. 2, Khabarovsk 680000</p></bio><email xlink:type="simple">trotsenko_oe@hniiem.ru</email><xref ref-type="aff" rid="aff-3"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-3010-3054</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Курганова</surname><given-names>О. П.</given-names></name><name name-style="western" xml:lang="en"><surname>Kurganova</surname><given-names>O. P.</given-names></name></name-alternatives><bio xml:lang="ru"><p>кандидат медицинских наук, руководитель, </p><p>675002, г. Благовещенск, ул. Первомайская, 30</p></bio><bio xml:lang="en"><p>Cand. Sc. (Med.), Head,</p><p>Pervomaiskaya str. 30, Blagoveshchensk 675002</p></bio><email xlink:type="simple">info@rospotrebnadzor-amur.ru</email><xref ref-type="aff" rid="aff-4"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-7543-0633</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Детковская</surname><given-names>Т. Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Detkovskaya</surname><given-names>T. N.</given-names></name></name-alternatives><bio xml:lang="ru"><p>руководитель Управления,</p><p>690087, г. Владивосток, ул. Сельская ул., 3</p></bio><bio xml:lang="en"><p>Head, </p><p>Selskaya str. 3, Vladivostok 690087</p></bio><email xlink:type="simple">Detkovskaya_TN@pkrpn.ru</email><xref ref-type="aff" rid="aff-5"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-9921-3505</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Лялина</surname><given-names>Л. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Lyalina</surname><given-names>L. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>доктор медицинских наук, профессор, заведующая лабораторией эпидемиологии инфекционных и неинфекционных заболеваний, </p><p>197101, г. Санкт-Петербург, ул. Мира, 14</p></bio><bio xml:lang="en"><p>Dr. Sc. (Med.), Professor, Head of the Laboratory of Epidemiology of Infectious and Non-infectious Diseases,</p><p>Mira str. 14, Saint Petersburg 197101</p></bio><email xlink:type="simple">lyalina@pasteurorg.ru</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-3278-9216</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Аббасова</surname><given-names>Е. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Abbasova</surname><given-names>E. I.</given-names></name></name-alternatives><bio xml:lang="ru"><p>начальник эпидемиологического отдела, </p><p>690087, г. Владивосток, ул. Сельская ул., 3</p></bio><bio xml:lang="en"><p>Head of the Epidemiological Department,</p><p>Selskaya str. 3, Vladivostok 690087</p></bio><email xlink:type="simple">epid_rpn_pk@pkrpn.ru</email><xref ref-type="aff" rid="aff-5"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-5794-3689</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Юргина</surname><given-names>О. М.</given-names></name><name name-style="western" xml:lang="en"><surname>Yurgina</surname><given-names>O. M.</given-names></name></name-alternatives><bio xml:lang="ru"><p>главный врач, </p><p>675002, г. Благовещенск, ул. Первомайская, 30</p></bio><bio xml:lang="en"><p>Chief Physician,</p><p>Pervomaiskaya str. 30, Blagoveshchensk 675002</p></bio><email xlink:type="simple">office@cge-amur.ru</email><xref ref-type="aff" rid="aff-6"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Романова</surname><given-names>О. Б.</given-names></name><name name-style="western" xml:lang="en"><surname>Romanova</surname><given-names>O. B.</given-names></name></name-alternatives><bio xml:lang="ru"><p>главный врач, </p><p>690000, г. Владивосток, ул. Уткинская, 36</p></bio><bio xml:lang="en"><p>Chief Physician,</p><p>Utkinskaya str. 36, Vladivostok 690000</p></bio><email xlink:type="simple">Romanova_OB@fguzpk.ru</email><xref ref-type="aff" rid="aff-7"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-6750-8920</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Пятырова</surname><given-names>Е. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Pyatyrova</surname><given-names>E. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>заместитель главного врача по экспертной деятельности,</p><p>690000, г. Владивосток, ул. Уткинская, 36</p></bio><bio xml:lang="en"><p>Deputy Chief Physician for Expert Activities,</p><p>Utkinskaya str. 36, Vladivostok 690000</p></bio><email xlink:type="simple">sangigexp@fguzpk.ru</email><xref ref-type="aff" rid="aff-7"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-9931-9203</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Бурдинская</surname><given-names>Е. Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Burdinskaya</surname><given-names>E. N.</given-names></name></name-alternatives><bio xml:lang="ru"><p>заместитель главного врача, </p><p>675002, г. Благовещенск, ул. Первомайская, 30</p></bio><bio xml:lang="en"><p>Deputy Chief Physician,</p><p>Pervomaiskaya str. 30, Blagoveshchensk 675002</p></bio><email xlink:type="simple">office@cge-amur.ru</email><xref ref-type="aff" rid="aff-6"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-4888-0612</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Солохин</surname><given-names>А. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Solokhin</surname><given-names>A. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>заместитель начальника, </p><p>675002, г. Благовещенск, ул. Первомайская, 30</p></bio><bio xml:lang="en"><p>Deputy Head, </p><p>Pervomaiskaya str. 30, Blagoveshchensk 675002</p></bio><email xlink:type="simple">info@rospotrebnadzor-amur.ru</email><xref ref-type="aff" rid="aff-4"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-5316-0433</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Богдан</surname><given-names>Е. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Bogdan</surname><given-names>E. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>врач-эпидемиолог, </p><p>675002, г. Благовещенск, ул. Первомайская, 30</p></bio><bio xml:lang="en"><p>Epidemiologist,</p><p>Pervomaiskaya str. 30, Blagoveshchensk 675002</p></bio><email xlink:type="simple">office@cge-amur.ru</email><xref ref-type="aff" rid="aff-6"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-5695-6752</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Базыкина</surname><given-names>Е. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Bazykina</surname><given-names>E. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>младший научный сотрудник, </p><p>680000, г. Хабаровск, ул. Шевченко, 2</p></bio><bio xml:lang="en"><p>Junior Research Officer,</p><p>Shevchenko str. 2, Khabarovsk 680000</p></bio><email xlink:type="simple">adm@hniiem.ru</email><xref ref-type="aff" rid="aff-3"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-4571-8799</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Тотолян</surname><given-names>А. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Totolian</surname><given-names>A. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>академик РАН, доктор медицинских наук, профессор, директор, </p><p>197101, г. Санкт-Петербург, ул. Мира, 14</p></bio><bio xml:lang="en"><p>Dr. Sc. (Med.), Professor, Academician of RAS, Director, </p><p>Mira str. 14, Saint Petersburg 197101</p></bio><email xlink:type="simple">pasteur@pasteurorg.ru</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Федеральная служба по надзору в сфере защиты прав потребителей и благополучия человека</institution></aff><aff xml:lang="en"><institution>Federal Service for Supervision of Consumer Rights Protection and Human Welfare (Rospotrebnadzor)</institution></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>ФБУН «Санкт-Петербургский научно-исследовательский институт эпидемиологии и микробиологии им. Пастера» Роспотребнадзора</institution></aff><aff xml:lang="en"><institution>Saint Petersburg Pasteur Institute</institution></aff></aff-alternatives><aff-alternatives id="aff-3"><aff xml:lang="ru"><institution>ФБУН «Хабаровский научноисследовательский институт эпидемиологии и микробиологии» Роспотребнадзора</institution></aff><aff xml:lang="en"><institution>Khabarovsk Research Institute of Epidemiology and Microbiology</institution></aff></aff-alternatives><aff-alternatives id="aff-4"><aff xml:lang="ru"><institution>Управление Роспотребнадзора по Амурской области</institution></aff><aff xml:lang="en"><institution>Rospotrebnadzor Administration in the Amur Region</institution></aff></aff-alternatives><aff-alternatives id="aff-5"><aff xml:lang="ru"><institution>Управление Роспотребнадзора по Приморскому краю</institution></aff><aff xml:lang="en"><institution>Rospotrebnadzor Administration in the Primorsky Krai</institution></aff></aff-alternatives><aff-alternatives id="aff-6"><aff xml:lang="ru"><institution>ФБУЗ «Центр гигиены и эпидемиологии в Амурской области»</institution></aff><aff xml:lang="en"><institution>Center for Hygiene and Epidemiology in the Amur Region</institution></aff></aff-alternatives><aff-alternatives id="aff-7"><aff xml:lang="ru"><institution>ФБУЗ «Центр гигиены и эпидемиологии по Приморскому краю»</institution></aff><aff xml:lang="en"><institution>Center for Hygiene and Epidemiology in Primorsky Krai</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2021</year></pub-date><pub-date pub-type="epub"><day>23</day><month>11</month><year>2021</year></pub-date><volume>6</volume><issue>5</issue><fpage>253</fpage><lpage>273</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Попова А.Ю., Смирнов В.С., Ежлова Е.Б., Мельникова А.А., Троценко О.Е., Курганова О.П., Детковская Т.Н., Лялина Л.В., Аббасова Е.И., Юргина О.М., Романова О.Б., Пятырова Е.В., Бурдинская Е.Н., Солохин А.С., Богдан Е.В., Базыкина Е.А., Тотолян А.А., 2021</copyright-statement><copyright-year>2021</copyright-year><copyright-holder xml:lang="ru">Попова А.Ю., Смирнов В.С., Ежлова Е.Б., Мельникова А.А., Троценко О.Е., Курганова О.П., Детковская Т.Н., Лялина Л.В., Аббасова Е.И., Юргина О.М., Романова О.Б., Пятырова Е.В., Бурдинская Е.Н., Солохин А.С., Богдан Е.В., Базыкина Е.А., Тотолян А.А.</copyright-holder><copyright-holder xml:lang="en">Popova A.Y., Smirnov V.S., Ezhlova E.B., Melnikova A.A., Trotsenko O.E., Kurganova O.P., Detkovskaya T.N., Lyalina L.V., Abbasova E.I., Yurgina O.M., Romanova O.B., Pyatyrova E.V., Burdinskaya E.N., Solokhin A.S., Bogdan E.V., Bazykina E.A., Totolian A.A.</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.actabiomedica.ru/jour/article/view/3060">https://www.actabiomedica.ru/jour/article/view/3060</self-uri><abstract><sec><title>Цель</title><p>Цель: исследовать структуру и динамику популяционного иммунитета к SARS-CoV-2 населения Южных Регионов Дальнего Востока (ЮРДВ): Хабаровского, Приморского краёв и Амурской области в период эпидемии COVID-19 в 2020 г.</p></sec><sec><title>Материалы и методы</title><p>Материалы и методы. Работа проводилась по программе оценки популяционного иммунитета к SARS-CoV-2 населения РФ по методике, разработанной Роспотребнадзором РФ при участии НИИЭМ им.  Пастера. Исследование одобрено этическим комитетом института им. Пастера. Отбор участников проводили методом анкетирования с использованием облачных технологий. Рандомизацию волонтёров проводили по возрасту путём стратификации на 7  возрастных групп: 1–17, 18–29, 30–39, 40–49, 50–59, 60–69, 70+  лет. Рандомизация по территориальному признаку заключалась в ограничении привлечения волонтёров – не более 30 человек с одного предприятия. После первичного поперечного исследования был проведён трёхэтапный серомониторинг, в котором участвовали одни и те же волонтёры. Антитела к нуклеокапсиду SARS-CoV-2 определяли в сыворотке периферической крови иммуноферментным методом с применением соответствующего набора реагентов производства ГНЦПМиБ Роспотребнадзора (г.  Оболенск). Статистический анализ проводили с использованием пакета Excel. Доверительный интервал доли рассчитывали по методу A. Wald, J. Wolfowitz с корректировкой A. Agresti, B.A. Coull. Расчёт статистической значимости различий проводили с помощью специализированного онлайн-калькулятора. Статистическую значимость различий оценивали с вероятностью p˂ 0,05, если не указано иначе.</p></sec><sec><title>Результаты</title><p>Результаты. При сравнительном анализе наибольшую заболеваемость наблюдали в Хабаровском крае, наименьшую – в Приморском крае. Уровень серопревалентности среди населения региона составил: 19,6 % (95% ДИ: 18,2–21,1) в Хабаровском крае, 19,6 % (95% ДИ: 18,1–21,2) в Приморском крае и  45,5  % (95%  ДИ: 43,7–47,3) в Амурской области. Наибольшая серопревалентность отмечена среди детей 1–17  лет, преимущественно за счёт подгруппы 14–17 лет. Наименьшая доля серопозитивных выявлена среди 40–49-летних в Хабаровском крае (14,7 %, 95% ДИ: 11,2–18,6), 18–28-летних в Приморском крае (13,3 %, 95% ДИ: 10,0–17,1) и 30–39-летних в Амурской области (36,3 %, 95% ДИ: 31,7–41,6). Не установлено статистически значимой зависимости серопревалентности от территориальных и профессиональных факторов за исключением увеличения доли серопозитивных медиков в Приморском крае. В процессе трёхэтапного серомониторинга выявлен закономерный рост доли серопозитивных во всех ЮРВД. Полученная тенденция корректно описывается полиномом 2-го порядка. Выявлена зависимость между числом реконвалесцентов и контактировавших с ними лиц, что позволило вычислить базовое репродуктивное число (R0) в пределах от 1,4 (Приморский край) до 2,4 (Амурская область). При анализе серопревалентных волонтёров показано, что число лиц с бессимптомным течением варьировало в пределах от 94,1 % (95% ДИ: 92,8–95,3) до 98,3 % (95% ДИ: 98,8–99,2). Это свидетельствует о том, что большинство волонтёров переносило COVID-19 бессимптомно.</p></sec><sec><title>Выводы</title><p>Выводы. Сравнительное исследование показало преобладание серопревалентности в Амурской области по сравнению с Хабаровским и Приморским краями. Отмечена зависимость между числом реконвалесцентов и контак тировавших с ними лиц. Вычислено значение базового R0. Показано, что у более 90 % серопозитивных лиц в ЮРДВ COVID-10 протекала бессимптомно. </p></sec></abstract><trans-abstract xml:lang="en"><sec><title>The aim</title><p>The aim: to study the structure and dynamics of population immunity to SARSCoV-2 of the population of the Southern Regions of the Far East (SRFE): Khabarovsk, Primorsky Krai and Amur Region during the COVID-19 epidemic in 2020.</p></sec><sec><title>Materials and methods</title><p>Materials and methods. The work was carried out according to the program for assessing population immunity to SARS -CoV-2 of the population of the Russian Federation according to the methodology developed by the Rospotrebnadzor with the  participation of the St.  Petersburg Pasteur Institute. The study was approved by  the  ethical committee of the St.  Petersburg Pasteur Institute. The selection of participants was carried out by a questionnaire method using cloud technologies. The  volunteers were randomized by age by stratification into 7  age groups: 1–17, 18–29, 30–39, 40–49, 50–59, 60–69, 70+ years old. Territorial randomization consisted in limiting the engaging of volunteers – no more than 30 people from one enterprise. After the initial cross-sectional study, a 3-stage seromonitoring was carried out, in which the same volunteers participated. Antibodies to the SARS-CoV-2 nucleocapsid were determined in peripheral blood serum by the enzyme immunoassay using an appropriate set of reagents produced by the State Scientific Center for Medical and Biological Sciences of the Rospotrebnadzor (Obolensk). Statistical analysis was performed using the Excel package. The confidence interval for the proportion was calculated using the A. Wald, J. Wolfowitz method with A. Agresti, B.A. Coull’s correction. The statistical significance of the differences was calculated online using a specialized calculator. The statistical significance of the differences was assessed with a probability of p˂ 0.05, unless otherwise indicated.</p></sec><sec><title>Results</title><p>Results. In a comparative analysis, the highest morbidity was observed in the Khabarovsk Territory, the lowest – in the Primorsky Territory. The level of seroprevalence among the population of the region was 19.6 % (95 % CI: 18.2–21.1) in  the  Khabarovsk Territory, 19.6  % (95  %  CI: 18.1–21.2) in the Primorsky Territory19,6 % and 45,5 % (95 % CI: 43.7–47.3) in the Amur region. The highest seroprevalence was noted among 1–17 years old children, mainly due to the subgroup of 14–17-years-olds. The smallest proportion of seropositive was found among 40–49-year-olds in the Khabarovsk Territory (14.7 %, 95 % CI: 11.2–18.6), 18–28-yearolds in the Primorsky Territory (13.3 %, 95 % CI: 10.0–17.1) and 30–39-year-olds in the Amur Region (36.3  %, 95%  CI:  31.7–41.6). No statistically significant dependence of  seroprevalence on territorial and occupational factors has been established, with the exception of an increase in the proportion of seropositive medical workers in Primorsky Territory. In the process of 3-stage seromonitoring, a regular increase in the proportion of seropositive people was revealed in all SRFE. The resulting tendency is correctly described by a second-order polynomial. A relationship was revealed between the number of convalescents and persons in contact with them, which made it possible to calculate the base reproductive number (R0) in the range from 1.4 (Primorsky Territory) to 2.4 (Amur Region). Analysis of seroprevalent volunteers showed that the number of asymptomatic individuals varied from 94.1 % (95 % CI: 92.8–95.3) to 98.3 % (95 % CI: 98.8–99.2). This indicates that most of the volunteers had COVID-19 asymptomatically.</p></sec><sec><title>Conclusions</title><p>Conclusions. A comparative study showed the prevalence of seroprevalence in the Amur Region compared with the Khabarovsk and Primorsky Territories. The relationship between the number of convalescents and persons in contact with them was noted. The value of the base R0 is calculated. It has been shown that more than 90 % of seropositive individuals in the COVID-10 SRFE were asymptomatic.</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>коронавирусы</kwd><kwd>COVID-19</kwd><kwd>заболеваемость</kwd><kwd>серопревалентность</kwd><kwd>серомониторинг</kwd><kwd>Хабаровский край</kwd><kwd>Приморский край</kwd><kwd>Амурская область</kwd><kwd>население</kwd><kwd>бессимптомное течение</kwd></kwd-group><kwd-group xml:lang="en"><kwd>coronaviruses</kwd><kwd>COVID-19</kwd><kwd>morbidity</kwd><kwd>seroprevalence</kwd><kwd>seromonitoring</kwd><kwd>Khabarovsk Territory</kwd><kwd>Primorsky Territory</kwd><kwd>Amur Region</kwd><kwd>population</kwd><kwd>asymptomatic course</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Авторы выражают благодарность сотрудникам ФБУЗ «Центра гигиены и эпидемиологии в Приморском крае» В.М. Слоновой, П.В. Сухоруковой, Н.М. Христич и Ю.А. 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