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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.2026-11.1.24</article-id><article-id custom-type="elpub" pub-id-type="custom">actabiomedica-5885</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>Влияние паводка на очаг лептоспироза в Иркутской области</article-title><trans-title-group xml:lang="en"><trans-title>The impact of floods on the Leptospirosis outbreak in the Irkutsk Region</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-3588-8145</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Будаева</surname><given-names>С. Е.</given-names></name><name name-style="western" xml:lang="en"><surname>Budaeva</surname><given-names>S. E.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Будаева Софья Евгеньевна - младший научный сотрудник отдела эпидемиологии.</p><p>664047, Иркутск, ул. Трилиссера, д. 78</p></bio><bio xml:lang="en"><p>Sofia E. Budaeva - junior laboratory research assistant of the epidemiology department, Irkutsk Research Anti-Plague Institute of Siberia and the Far East of Rospotrebnadzor.</p><p>Trilissera str., 78, Irkutsk 664047</p></bio><email xlink:type="simple">inst.4ever.youu@yandex.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/0000-0002-9207-7536</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Бренёва</surname><given-names>Н. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Breneva</surname><given-names>N. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Бренёва Наталья Владимировна - кандидат медицинских наук, ведущий научный сотрудник отдела эпидемиологии.</p><p>664047, Иркутск, ул. Трилиссера, д. 78</p></bio><bio xml:lang="en"><p>Natalya V. Breneva - Cand. Sc. (Med.), leading research assistant of the epidemiology department, Irkutsk Research Anti-Plague Institute of Siberia and the Far East of Rospotrebnadzor.</p><p>Trilissera str., 78, Irkutsk 664047</p></bio><email xlink:type="simple">nbreneva@list.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/0000-0002-3965-9801</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Киселева</surname><given-names>Е. Ю.</given-names></name><name name-style="western" xml:lang="en"><surname>Kiseleva</surname><given-names>E. Yu.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Киселева Евгения Юрьевна - врач-бактериолог отдел биологического и технологического контроля.</p><p>664047, Иркутск, ул. Трилиссера, д. 78</p></bio><bio xml:lang="en"><p>Evgenia Yu. Kiseleva - Cand. Sc. (Med.), bacteriologist of the biological and technological control department, Irkutsk Research Anti-Plague Institute of Siberia and the Far East of Rospotrebnadzor.</p><p>Trilissera str., 78, Irkutsk 664047</p></bio><email xlink:type="simple">e.kisseleva.2010@mail.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/0000-0002-1114-1795</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Шаракшанов</surname><given-names>М. Б.</given-names></name><name name-style="western" xml:lang="en"><surname>Sharakshanov</surname><given-names>M. B.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Шаракшанов Мунко Баярович - врач-эпидемиолог лаборатории природно-очаговых вирусных инфекций.</p><p>664047, Иркутск, ул. Трилиссера, д. 78</p></bio><bio xml:lang="en"><p>Munko B. Sharakshanov - epidemiologist of the laborator/ of natural focal viral infections, Irkutsk Research Anti-Plague Institute of Siberia and the Far East of Rospotrebnadzor.</p><p>Trilissera str., 78, Irkutsk 664047</p></bio><email xlink:type="simple">adm@chumin.irkutsk.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Тимошенко</surname><given-names>А. Ф.</given-names></name><name name-style="western" xml:lang="en"><surname>Timoshenko</surname><given-names>A. F.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Тимошенко Александр Федорович – зоолог.</p><p>664047, Иркутск, ул. Трилиссера, д. 51</p></bio><bio xml:lang="en"><p>Alexandr F. Timoshenko - zoologist of the Center for Hygiene and Epidemiology in the Irkutsk Region.</p><p>Trilissera str., 51, Irkutsk 664047</p></bio><email xlink:type="simple">ilim19@yandex.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/0000-0002-1676-6479</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Рудаков</surname><given-names>Д. М.</given-names></name><name name-style="western" xml:lang="en"><surname>Rudakov</surname><given-names>D. M.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Рудаков Данил Михайлович - лаборант-исследователь зоолого-паразитологического отдела.</p><p>664047, Иркутск, ул. Трилиссера, д. 78</p></bio><bio xml:lang="en"><p>Danil M. Rudakov - laboratory research assistant of the zoological and parasitological department, Irkutsk Research Anti-Plague Institute of Siberia and the Far East of Rospotrebnadzor.</p><p>Trilissera str., 78, Irkutsk 664047</p></bio><email xlink:type="simple">danil.rydakov@yandex.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>ФКУЗ Иркутский научно-исследовательский противочумный институт Сибири и Дальнего Востока Роспотребнадзора</institution></aff><aff xml:lang="en"><institution>Irkutsk Research Anti-Plague Institute of Siberia and the Far East of Rospotrebnadzor</institution></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>ФБУЗ Центр гигиены и эпидемиологии в Иркутской области</institution></aff><aff xml:lang="en"><institution>Center for Hygiene and Epidemiology in the Irkutsk Region</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2026</year></pub-date><pub-date pub-type="epub"><day>26</day><month>03</month><year>2026</year></pub-date><volume>11</volume><issue>1</issue><fpage>248</fpage><lpage>256</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Будаева С.Е., Бренёва Н.В., Киселева Е.Ю., Шаракшанов М.Б., Тимошенко А.Ф., Рудаков Д.М., 2026</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="ru">Будаева С.Е., Бренёва Н.В., Киселева Е.Ю., Шаракшанов М.Б., Тимошенко А.Ф., Рудаков Д.М.</copyright-holder><copyright-holder xml:lang="en">Budaeva S.E., Breneva N.V., Kiseleva E.Y., Sharakshanov M.B., Timoshenko A.F., Rudakov D.M.</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/5885">https://www.actabiomedica.ru/jour/article/view/5885</self-uri><abstract><sec><title>Обоснование</title><p>Обоснование. В 2019 г. в результате прошедшего широкомасштабного паводка в Иркутской области была разрушена инфраструктура восьми муниципальных районов. На пострадавшей территории, в Нижнеудинском районе, проведены наблюдения за природным очагом лептоспироза.</p></sec><sec><title>Цель исследования</title><p>Цель исследования. Оценить влияние паводка на природный очаг лептоспироза.</p></sec><sec><title>Материалы и методы</title><p>Материалы и методы. Проводили учет численности и отловы мелких млекопитающих (ММ) в пойменно-болотных и лесокустарниковых стациях. В 2012,2014,2019,2021-2023 гг. отловлено 493 особи ММ. Исследовали биологический материал от людей и животных молекулярно-биологическими и серологическими методами.</p></sec><sec><title>Результаты</title><p>Результаты. Во время паводка активность очага была значительно снижена, в 2021-2022 гг. выявлен рост численности (до 22,0 % попаданий на 100 л/с) и инфицированности (до 14,0 ± 5,3 %) носителей в очаге. Кроме того, источником инфекции могут стать сельскохозяйственные и домашние животные, так как, например, у непривитого скота обнаруживаются антитела к лептоспирам до 90,0 ± 6,7 %. Высокая серопревалентность населения (до 20,0 ± 5,7 %) свидетельствует об эпизодических контактах с инфекцией.</p></sec><sec><title>Заключение</title><p>Заключение. Паводок 2019 г. способствовал временному снижению активности природного очага лептоспироза, однако в дальнейшем сформировалась тенденция к ухудшению эпизоотической ситуации. В связи с этим необходимо проведение профилактических мероприятий.</p></sec></abstract><trans-abstract xml:lang="en"><sec><title>Background</title><p>Background. In 2019, because of the past large-scale flood in the Irkutsk region, the infrastructure of eight municipal districts was destroyed. In the affected territory - Nizhneudinsky district, observations were made on the natural focus of leptospirosis.</p></sec><sec><title>The aim</title><p>The aim. To assess the impact of the flood on the natural focus of leptospirosis.</p></sec><sec><title>Materials and methods</title><p>Materials and methods. Small mammals (SM) were counted and captured in flood-plain-marsh and forest-shrub stations. In 2012, 2014, 2019, 2021-2023, 493 SM individuals were captured. Biological material from humans and animals was examined using molecular biological and serological methods.</p></sec><sec><title>Results</title><p>Results. During the flood, the activity of the focus was significantly reduced, and in 2021-2022, an increase in the number (up to 22.0 % of hits per 100 l/s) and infection rate (up to 14.0 ± 5.3 %) of carriers in the focus was detected. In addition, agricultural and domestic animals can become a source of infection; for example, up to 90.0 ± 6.7 % of unvaccinated livestock have antibodies to leptospires. The high seroprevalence of the population (up to 20.0 ± 5.7 %) indicates sporadic contacts with the infection.</p></sec><sec><title>Conclusion</title><p>Conclusion. The flood of 2019 contributed to a temporary decrease in the activity of the natural focus of leptospirosis, but later, there was a tendency for the epizootic situation to worsen. Therefore, preventive measures are necessary.</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>лептоспироз</kwd><kwd>природный очаг</kwd><kwd>паводок</kwd><kwd>эпизоотологический и эпидемиологический мониторинг</kwd><kwd>резервуар инфекции</kwd></kwd-group><kwd-group xml:lang="en"><kwd>leptospirosis</kwd><kwd>natural focus</kwd><kwd>flood</kwd><kwd>epizootological and epidemiological monitoring</kwd><kwd>infection host</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">Ананьина Ю.В. 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