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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">epidemiology</journal-id><journal-title-group><journal-title xml:lang="ru">Эпидемиология и Вакцинопрофилактика</journal-title><trans-title-group xml:lang="en"><trans-title>Epidemiology and Vaccinal Prevention</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2073-3046</issn><issn pub-type="epub">2619-0494</issn><publisher><publisher-name>«Numicom» LLC</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.31631/2073-3046-2025-24-6-11-18</article-id><article-id custom-type="elpub" pub-id-type="custom">epidemiology-2335</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>ОРИГИНАЛЬНЫЕ СТАТЬИ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>ORIGINAL ARTICLES</subject></subj-group></article-categories><title-group><article-title>Серотиповой состав, клональность и распространенность генов вирулентности у изолятов Streptococcus agalactiae, выделенных в РФ в 2021–2024 гг.</article-title><trans-title-group xml:lang="en"><trans-title>Serotypes, Clonality, and Virulence Gene Distribution in Streptococcus agalactiae Isolates recovered in Russian Federation in 2021–2024</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-1096-4324</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Егорова</surname><given-names>Е. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Egorova</surname><given-names>E. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Егорова Екатерина Александровна, к. б. н., ведущий научный сотрудник, исследовательский центр по изучению бактериальных инфекций</p><p>125212, Москва, ул. Адмирала Макарова, 10</p><p>+7 (495) 459-12-88</p><p>+7 (916) 594-69-31</p></bio><bio xml:lang="en"><p>Egorova Ekaterina A., Cand. Sci. (Biol.), Leading researcher, Center for research in bacterial infections</p><p>10, Admiral Makarov Street, Moscow, 125212</p><p>+7 (495) 459-12-88</p><p>+7 (916) 594-69-31</p></bio><email xlink:type="simple">yegorovaea@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/0000-0003-0189-3608</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Урбан</surname><given-names>Ю. Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Urban</surname><given-names>Y. N.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Юлия Николаевна Урбан  – к. б. н., руководитель Геномного центра</p><p>125212, Москва, ул. Адмирала Макарова, 10</p><p>+7 (495) 459-12-88</p><p>+7 (926) 181-05-60</p><p> </p></bio><bio xml:lang="en"><p>Yulia N. Urban  – Cand. Sci. (Biol.), Head of the Genomic center</p><p>10, Admiral Makarov Street, Moscow, 125212</p><p>+7 (495) 459-12-88</p><p>+7 (926) 181-05-60</p></bio><email xlink:type="simple">urban@gabrich.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/0000-0001-9289-0765</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Байракова</surname><given-names>А. Л.</given-names></name><name name-style="western" xml:lang="en"><surname>Bayrakova</surname><given-names>A. L.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Александра Львовна Байракова – к. б. н., ведущий научный сотрудник, Исследовательский центр по изучению бактериальных инфекций</p><p>125212, Москва, ул. Адмирала Макарова, 10</p><p>+7 (495) 459-12-88</p><p>+7 (926) 207-24-15</p></bio><bio xml:lang="en"><p>Alexandra L. Bairakova – Cand. Sci. (Biol.), Leading researcher, Center for research in bacterial infections</p><p>10, Admiral Makarov Street, Moscow, 125212</p><p> +7 (495) 459-12-88</p><p>+7 (926) 207-24-15</p></bio><email xlink:type="simple">bairakova@gabrich.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/0000-0002-0999-836X</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Гречишникова</surname><given-names>О. Г.</given-names></name><name name-style="western" xml:lang="en"><surname>Grechishnikova</surname><given-names>O. G.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Ольга Геннадиевна Гречишникова – к. б. н., руководитель исследовательского центра по изучению бактериальных инфекций</p><p>125212, Москва, ул. Адмирала Макарова, 10</p><p>+7 (495) 459-12-88</p><p>+7 (965) 440-45-05</p></bio><bio xml:lang="en"><p>Olga G. Grechishnikova – Cand. Sci. (Biol.), Head of the Center for research in bacterial infections</p><p>10, Admiral Makarov Street, Moscow, 125212</p><p>+7 (495) 459-12-88</p><p>+7 (965) 440-45-05</p></bio><email xlink:type="simple">grechishnikova@gabrich.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/0009-0002-7301-238X</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Кузменюк</surname><given-names>В. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Kuzmenok</surname><given-names>V. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Вячеслав Алексеевич Кузменюк – младший научный сотрудник, Центр мультиомиксных исследований микробиома человека</p><p>125212, Москва, ул. Адмирала Макарова, 10</p><p>+7 (999) 527-44-26</p></bio><bio xml:lang="en"><p>Vyacheslav А. Kuzmenok – junior research assistant, Center for multiomics research in human microbiome</p><p>10, Admiral Makarov Street, Moscow, 125212</p><p>+7 (999) 527-44-26</p></bio><email xlink:type="simple">kuzmenok.vyacheslav@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/0000-0002-0463-0136</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Воропаева</surname><given-names>Е. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Voropaeva</surname><given-names>E. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Елена Александровна Воропаева  – д. б. н., заместитель директора по медицинской биотехнологии</p><p>125212, Москва, ул. Адмирала Макарова, 10</p><p>+7 (495) 452-18-16</p><p>+7 (916) 532-03-22</p></bio><bio xml:lang="en"><p>Elena A. Voropaeva – Dr. Sci. (Biol.), Vice Director for medical biotechnology</p><p>10, Admiral Makarov Street, Moscow, 125212</p><p>+7 (495) 452-18-16</p><p>+7 (916) 532-03-22</p></bio><email xlink:type="simple">voropaeva@gabrich.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>Румянцева</surname><given-names>Е. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Rumiantseva</surname><given-names>E V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Елена Владимировна Румянцева – руководитель лаборатории микробиологии</p><p>191119, Санкт-Петербург, ул. Достоевского, д. 40-44, литр. А, часть пом. 9Н (пом. 17)</p><p>+7 (911) 907-21-62</p></bio><bio xml:lang="en"><p>Elena V. Rumiantseva – Head of microbiology laboratory</p><p>40-44, litr. A, chast pom. 9N (pom. 17), Dostoyevskogo str., Saint Petersburg, 191119</p><p>+7 (911) 907-21-62</p></bio><email xlink:type="simple">erumyantseva@labstori.ru</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Митьковец</surname><given-names>П. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Mitkovets</surname><given-names>P. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Полина Владимировна Митьковец  – врач-бактериолог</p><p>191119, Санкт-Петербург, ул. Достоевского, д. 40-44, литр. А, часть пом. 9Н (пом. 17)</p><p>+7 (911) 763-03-77</p></bio><bio xml:lang="en"><p>Polina V. Mitkovets – bacteriologist</p><p>40-44, litr. A, chast pom. 9N (pom. 17), Dostoyevskogo str., Saint Petersburg, 191119</p><p>+7 (911) 763-03-77</p></bio><email xlink:type="simple">vaeltajapolina@yandex.ru</email><xref ref-type="aff" rid="aff-3"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>ФБУН «Московский научно-исследовательский институт эпидемиологии и микробиологии им. Г. Н. Габричевского Роспотребнадзора</institution><country>Россия</country></aff><aff xml:lang="en"><institution>G. N. Gabrichevsky Research Institute for Epidemiology and Microbiology</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Медицинский Центр Лабстори</institution><country>Россия</country></aff><aff xml:lang="en"><institution>G. N. Gabrichevsky Research Institute for Epidemiology and Microbiology</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-3"><aff xml:lang="ru"><institution>Медицинский Центр Лабстори</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Labstory Medical Center</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2025</year></pub-date><pub-date pub-type="epub"><day>02</day><month>01</month><year>2026</year></pub-date><volume>24</volume><issue>6</issue><fpage>11</fpage><lpage>18</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Егорова Е.А., Урбан Ю.Н., Байракова А.Л., Гречишникова О.Г., Кузменюк В.А., Воропаева Е.А., Румянцева Е.В., Митьковец П.В., 2026</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="ru">Егорова Е.А., Урбан Ю.Н., Байракова А.Л., Гречишникова О.Г., Кузменюк В.А., Воропаева Е.А., Румянцева Е.В., Митьковец П.В.</copyright-holder><copyright-holder xml:lang="en">Egorova E.A., Urban Y.N., Bayrakova A.L., Grechishnikova O.G., Kuzmenok V.A., Voropaeva E.A., Rumiantseva E.V., Mitkovets P.V.</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.epidemvac.ru/jour/article/view/2335">https://www.epidemvac.ru/jour/article/view/2335</self-uri><abstract><sec><title>Актуальность</title><p>Актуальность. Streptococcus agalactiae (стрептококк группы В (СГВ)) является одним из ведущих возбудителей тяжелых перинатальных инфекций. В настоящее время основные характеристики популяции штаммов Streptococcus agalactiae в РФ остаются недостаточно изученными, что указывает на необходимость молекулярно-генетического мониторинга ее состава.</p></sec><sec><title>Цель</title><p>Цель. Провести комплексное исследование распространенности генетических детерминант вирулентности, а также серотипового и клонального составов изолятов S. agalactiae, выделенных в Российской Федерации в 2021–2024 гг.</p></sec><sec><title>Материалы и методы</title><p>Материалы и методы. Исследовано 72 неинвазивных изолята S. agalactiae, выделенных у 30 мужчин и 42 женщин в возрасте от 18 до 55 лет в Северо-Западном федеральном округе. Изоляты были выделены из различных видов биологического материала: вагинальных мазков, мазков из цервикального канала, уретры, секрета предстательной железы, мочи, спермы. Идентификация изолятов проводилась бактериологическими методами, а также с использованием латексагглютинации и ПЦР. Для определения серотипов, сиквенс-типов (ST), клональных комплексов (СС) и генов вирулентности применялось полногеномное секвенирование (WGS) с последующим биоинформатическим анализом.</p></sec><sec><title>Результаты и обсуждение</title><p>Результаты и обсуждение. Установлено, что преобладающими серотипами являются V (34,7 %), Ia (22,2%) и III (22,2 %), что в совокупности составляет 79,1 % изолятов. Выявлено 22 сиквенс-типа (ST), объединенных в 7 клональных комплексов (CC). Доминирующими являлись CC1 (29,2 %), CC23 (23,6 %), CC19 (19,4 %) и CC17 (12,5 %). Наиболее распространенным генотипом пилей был PI-1+PI-2A1 (36%). Гены поверхностного белка srr1 и альфа-подобных белков (Alph) выявлялись у 80,6% и 58% изолятов соответственно. Высоковирулентный комплекс CC17 характеризовался наличием генов hvgA, srr2 и rib.</p></sec><sec><title>Заключение</title><p>Заключение. Популяция S. agalactiae в РФ характеризуется значительным генетическим разнообразием при доминировании серотипов V, Ia, III и клональных комплексов CC1, CC23, CC19 и CC17. Выявление гипервирулентного клона CC17 (12,5 % изолятов) указывает на циркуляцию штаммов высокого риска, ассоциированных с неонатальными инвазивными инфекциями. Полученные результаты указывают на то, что шестивалентная конъюгированная вакцина потенциально может охватывать большую часть циркулирующих штаммов. Установленные профили генов вирулентности (пили, поверхностные белки) и их ассоциация с определенными клональными комплексами подтверждают их перспективность в качестве мишеней для разработки серотипнезависимых вакцин.</p></sec></abstract><trans-abstract xml:lang="en"><sec><title>Background</title><p>Background. Streptococcus agalactiae (Group B Streptococcus, GBS) remains a leading cause of severe perinatal infections. The key features of S. agalactiae population in Russia remain underexplored, necessitating comprehensive molecular surveillance.</p></sec><sec><title>Aim</title><p>Aim. This study aimed to perform a comprehensive analysis of the serotype distribution, clonality, and prevalence of genetic virulence determinants in S. agalactiae isolates recovered in Russia in 2021–2024.</p></sec><sec><title>Materials and Methods</title><p>Materials and Methods. We analysed 72 non-invasive S. agalactiae isolates. The isolates were collected in Northwestern Federal District between 2021 and 2024 from patients (30 males and 42 females, aged 18–55 years). We recovered the isolates from vaginal, cervical, and urethral swabs, urine, prostate secretion, and semen. We performed initial species identification by standard bacteriological methods, latex agglutination and PCR. The isolates were whole-genome sequenced. We used bioinformatic analysis to derive serotypes, multi-locus sequence types (ST), clonal complexes (CC) and virulence genes from genome data.</p></sec><sec><title>Results and Discussion</title><p>Results and Discussion. Our data revealed that serotypes V (34.7 %), Ia (22.2%), and III (22.2 %) were predominant, collectively accounting for 79.1 % of the isolates. The isolates exhibited high genetic diversity, comprising 22 sequence types (STs) grouped into 7 clonal complexes (CCs). The dominant CCs were CC1 (29.2 %), CC23 (23.6 %), CC19 (19.4 %), and CC17 (12.5 %). The most prevalent pilus genotype was PI-1+PI-2a1 (36%). The genes encoding surface protein Srr1 and Alp-like proteins were detected in 80.6% and 58% of isolates, respectively. The isolated of hypervirulent CC17 complex carried hvgA, srr2, and rib genes.</p></sec><sec><title>Conclusion</title><p>Conclusion. We found that the S. agalactiae isolates exhibited high genetic diversity, with predominant serotypes V, Ia, and III and clonal complexes CC1, CC23, CC19, and CC17. Our analysis revealed a prevalence (12.5%) of the hypervirulent CC17 clone, confirming the circulation of high-risk strains associated with neonatal invasive disease. Our results indicate that a hexavalent conjugate vaccine would likely cover a majority of the circulating strains. We identified specific virulence gene profiles and their association with certain clonal complexes. Our results suggest that the revealed virulence factors are promising targets for serotype-independent vaccine development.</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>Streptococcus agalactiae</kwd><kwd>полногеномное секвенирование (WGS)</kwd><kwd>серотипы</kwd><kwd>клональные комплексы</kwd><kwd>повехностные белки</kwd><kwd>вакцины</kwd></kwd-group><kwd-group xml:lang="en"><kwd>Streptococcus agalactiae</kwd><kwd>whole-genome sequencing (WGS)</kwd><kwd>serotypes</kwd><kwd>clonal complexes virulence genes</kwd><kwd>vaccines</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">Coggins SA, Puopolo KM. Neonatal Group B Streptococcus Disease Pediatrics in Review. 2024. Vol. 45, N2. P. 63–73.</mixed-citation><mixed-citation xml:lang="en">Coggins SA, Puopolo KM. Neonatal Group B Streptococcus Disease. 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