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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="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Epidemiology and Infectious Diseases</journal-id><journal-title-group><journal-title xml:lang="en">Epidemiology and Infectious Diseases</journal-title><trans-title-group xml:lang="ru"><trans-title>Эпидемиология и инфекционные болезни</trans-title></trans-title-group></journal-title-group><issn publication-format="print">3034-2007</issn><issn publication-format="electronic">3034-2015</issn><publisher><publisher-name xml:lang="en">Eco-Vector</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">624001</article-id><article-id pub-id-type="doi">10.17816/EID624001</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Original study articles</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Оригинальные исследования</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">The effect of vaccination against the COVID-19 on the course and outcomes of a new coronavirus infection: a retrospective analysis of laboratory and clinical indicators of hospitalized patients</article-title><trans-title-group xml:lang="ru"><trans-title>Влияние вакцинации против COVID-19 на течение и исходы новой коронавирусной инфекции: ретроспективный анализ клинико-эпидемиологических и лабораторных показателей у госпитализированных пациентов</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-0625-0284</contrib-id><contrib-id contrib-id-type="spin">5281-1670</contrib-id><name-alternatives><name xml:lang="en"><surname>Fomicheva</surname><given-names>Anastasia A.</given-names></name><name xml:lang="ru"><surname>Фомичева</surname><given-names>Анастасия Александровна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>MD</p></bio><email>anastasia.fomichova@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-6138-4330</contrib-id><contrib-id contrib-id-type="spin">2314-2076</contrib-id><name-alternatives><name xml:lang="en"><surname>Pimenov</surname><given-names>Nikolay N.</given-names></name><name xml:lang="ru"><surname>Пименов</surname><given-names>Николай Николаевич</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>MD, Cand. Sci. (Med.)</p></bio><bio xml:lang="ru"><p>кандидат медицинских наук</p></bio><email>n.pimenov@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-3766-1868</contrib-id><contrib-id contrib-id-type="spin">6583-0476</contrib-id><name-alternatives><name xml:lang="en"><surname>Tsygankova</surname><given-names>Anna E.</given-names></name><name xml:lang="ru"><surname>Цыганкова</surname><given-names>Анна Эдуардовна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>MD</p></bio><email>anna.tsygankova.inf@gmail.com</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-7823-9287</contrib-id><contrib-id contrib-id-type="spin">3734-7392</contrib-id><name-alternatives><name xml:lang="en"><surname>Tsapkova</surname><given-names>Natalia N.</given-names></name><name xml:lang="ru"><surname>Цапкова</surname><given-names>Наталья Николаевна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>MD, Cand. Sci. (Med.), Associate Professor</p></bio><bio xml:lang="ru"><p>кандидат медицинских наук, доцент</p></bio><email>tsapkova.natali@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Rokhlina</surname><given-names>Darya A.</given-names></name><name xml:lang="ru"><surname>Рохлина</surname><given-names>Дарья Александровна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>MD</p></bio><email>rokhlina_d_a@staff.sechenov.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-4581-4510</contrib-id><contrib-id contrib-id-type="spin">3342-4681</contrib-id><name-alternatives><name xml:lang="en"><surname>Volchkova</surname><given-names>Elena V.</given-names></name><name xml:lang="ru"><surname>Волчкова</surname><given-names>Елена Васильевна</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>доктор медицинских наук, профессор</p></bio><email>antononina@rambler.ru</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-8592-5624</contrib-id><contrib-id contrib-id-type="spin">3652-3811</contrib-id><name-alternatives><name xml:lang="en"><surname>Krasnova</surname><given-names>Svetlana V.</given-names></name><name xml:lang="ru"><surname>Краснова</surname><given-names>Светлана Васильевна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>MD, Cand. Sci. (Med.)</p></bio><bio xml:lang="ru"><p>кандидат медицинских наук</p></bio><email>krasnovasv@ikb2.ru</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-6303-9293</contrib-id><contrib-id contrib-id-type="spin">2336-4545</contrib-id><name-alternatives><name xml:lang="en"><surname>Chulanov</surname><given-names>Vladimir P.</given-names></name><name xml:lang="ru"><surname>Чуланов</surname><given-names>Владимир Петрович</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>доктор медицинских наук, профессор</p></bio><email>vladimir@chulanov.ru</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff3"/><xref ref-type="aff" rid="aff4"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">I.M. Sechenov First Moscow State Medical University (Sechenov University)</institution></aff><aff><institution xml:lang="ru">Первый Московский государственный медицинский университет имени И.М. Сеченова (Сеченовский Университет)</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Infectious Diseases Clinical Hospital No. 2</institution></aff><aff><institution xml:lang="ru">Инфекционная клиническая больница № 2</institution></aff></aff-alternatives><aff-alternatives id="aff3"><aff><institution xml:lang="en">National Medical Research Center of Phthisiopulmonology and Infectious Diseases</institution></aff><aff><institution xml:lang="ru">Национальный медицинский исследовательский центр фтизиопульмонологии и инфекционных заболеваний</institution></aff></aff-alternatives><aff-alternatives id="aff4"><aff><institution xml:lang="en">Sirius University of Science and Technology</institution></aff><aff><institution xml:lang="ru">Научно-технологический университет «Сириус»</institution></aff></aff-alternatives><pub-date date-type="preprint" iso-8601-date="2024-03-01" publication-format="electronic"><day>01</day><month>03</month><year>2024</year></pub-date><pub-date date-type="pub" iso-8601-date="2024-03-01" publication-format="electronic"><day>01</day><month>03</month><year>2024</year></pub-date><volume>29</volume><issue>1</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>18</fpage><lpage>28</lpage><history><date date-type="received" iso-8601-date="2023-11-28"><day>28</day><month>11</month><year>2023</year></date><date date-type="accepted" iso-8601-date="2024-02-28"><day>28</day><month>02</month><year>2024</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2024, Eco-vector</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2024, Эко-вектор</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="en">Eco-vector</copyright-holder><copyright-holder xml:lang="ru">Эко-вектор</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/" start_date="2027-03-01"/><license><ali:license_ref xmlns:ali="http://www.niso.org/schemas/ali/1.0/">https://creativecommons.org/licenses/by-nc-nd/4.0/</ali:license_ref></license></permissions><self-uri xlink:href="https://rjeid.com/1560-9529/article/view/624001">https://rjeid.com/1560-9529/article/view/624001</self-uri><abstract xml:lang="en"><p><bold>BACKGROUND</bold>: The Gam-COVID-Vac vaccine was proven effective in preventing the severe course and adverse outcomes of COVID-19 during different periods of the pandemic. However, the effect of vaccination on laboratory marker levels in hospitalized patients during the spread of the omicron variant of SARS-CoV-2 has not been sufficiently studied.</p> <p><bold>AIM:</bold> To assess the effect of vaccination on the severity and outcomes of COVID-19 in hospitalized patients during the dominance of the SARS-CoV-2 omicron variant in Russia.</p> <p><bold>MATERIALS AND METHODS:</bold> This case–control study included adult patients diagnosed with COVID-19 (U07.1) and hospitalized in infectious hospitals in Moscow between February 1, 2022, and July 31, 2022 (n=119). The main group included individuals vaccinated with two doses of Sputnik V vaccine (n=59). The control group included individuals who were not vaccinated (n=60). The median patient age was 66 [interquartile range, 41–66] years, and 58.8% were female. The chi-square test for categorical variables and the Mann–Whitney test for continuous variables were used for the analysis. P-values &lt;0.05 were considered statistically significant.</p> <p><bold>RESULTS:</bold> Viral pneumonia was less likely to develop in the vaccinated group than in the unvaccinated group (46.7% and 18.6%, respectively, p = 0.007). The proportion of patients without lung damage (0 CT-severity scores) in the vaccinated group (72.0%) was significantly higher than that in the unvaccinated group (42.9%) (p=0.003). In the vaccinated group, the levels of C-reactive protein on admission were lower (29.1 [7.4–68.6] mg/L and 75.1 [32.4–104.0] mg/L, p &lt;0.001), and the highest level was recorded during hospitalization (38.2 [12.0–84.0] mg/L and 92.2 [45.3–137.4] mg/L, p &lt;0.001). The D-dimer levels before discharge were lower in the group of patients vaccinated &lt;6 months ago than in the unvaccinated group (157.0 [107.0–297.0] ng/mL and 316.0 [125.0–556.0] ng/mL, respectively, p = 0.014). The frequency of deaths in the control group (11.7%) was 6.9 times higher than that in the main group (1.7%) (p = 0.030).</p> <p><bold>CONCLUSIONS:</bold> Completion of the primary vaccination course of Sputnik V vaccine resulted in lower levels of prognostic markers of severe COVID-19 (C-reactive protein and D-dimer) and a decrease in the frequency of pulmonary and fatal outcomes than in the unvaccinated group during the dominance of the omicron variant of SARS-CoV-2.</p></abstract><trans-abstract xml:lang="ru"><p><bold>Обоснование.</bold> Вакцина «Гам-КОВИД-Вак» доказала свою эффективность для профилактики тяжёлого течения и неблагоприятных исходов новой коронавирусной инфекции в разные периоды пандемии COVID-19, однако влияние вакцинации на уровни лабораторных маркеров у госпитализированных пациентов в период распространения варианта Омикрон SARS-CoV-2 изучено недостаточно.</p> <p><bold>Цель исследования — </bold>оценить влияние вакцинации против COVID-19 на тяжесть течения и исходы новой коронавирусной инфекции у госпитализированных пациентов в раннем периоде распространения варианта Омикрон SARS-CoV-2 в России.</p> <p><bold>Материалы и методы.</bold> В исследование были включены 119 взрослых пациентов (58,8% женщин, медиана возраста — 66 лет), госпитализированных в инфекционную клиническую больницу № 2 г. Москвы с 1 февраля 2022 года по 31 июля 2022 года с диагнозом COVID-19 (U07.1). В основную группу вошли пациенты, вакцинированные 2 дозами вакцины «Гам-КОВИД-Вак» (n=59), в контрольную — невакцинированные (n=60). Статистическую значимость отличий определяли для количественных переменных с помощью критерия Манна–Уитни, для категориальных — с помощью критерия χ<sup>2</sup> (уровень статистической значимости p &lt;0,05).</p> <p><bold>Результаты.</bold> Вирусная пневмония реже развивалась у вакцинированных лиц по сравнению с невакцинированными (46,7 и 18,6% соответственно, p = 0,007). Доля пациентов без поражения лёгких (КТ0) среди привитых (72,0%) была значительно выше, чем среди непривитых пациентов (42,9%) (p = 0,003). Уровень С-реактивного белка при поступлении был ниже в группе вакцинированных по сравнению с невакцинированными (29,1 [7,4–68,6] мг/л и 75,1 [32,4–104,0] мг/л соответственно, p &lt;0,001), как и максимальный уровень С-реактивного белка за период госпитализации (38,2 [12,0–84,0] мг/л и 92,2 [45,3–137,4] мг/л соответственно, p &lt;0,001). Уровень D-димера перед выпиской был ниже у вакцинированных &lt;6 месяцев назад по сравнению с невакцинированными (157,0 [107,0–297,0] нг/мл и 316,0 [125,0–556,0] нг/мл, p=0,014). Частота летальных исходов среди непривитых против COVID-19 (11,7%) была в 6,9 раза выше по сравнению с привитыми (1,7%) (p = 0,030).</p> <p><bold>Заключение.</bold> У пациентов с завершённым первичным курсом вакцинации вакциной «Гам-КОВИД-Вак» наблюдались достоверно более низкие уровни C - реактивного белка, D - димера, а также снижение частоты поражения лёгких и летальных исходов по сравнению с невакцинированными пациентами в период распространения варианта BA.2 Омикрон SARS-CoV-2.</p></trans-abstract><kwd-group xml:lang="en"><kwd>SARS-CoV-2</kwd><kwd>COVID-19</kwd><kwd>vaccination</kwd><kwd>outcomes</kwd><kwd>C-reactive protein</kwd><kwd>D-dimer</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>SARS-CoV-2</kwd><kwd>COVID-19</kwd><kwd>вакцинация</kwd><kwd>исходы</kwd><kwd>C-реактивный белок</kwd><kwd>D-димер</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">Weekly epidemiological update on COVID-19 — 4 January 2023. 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