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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">Problems of Virology</journal-id><journal-title-group><journal-title xml:lang="en">Problems of Virology</journal-title><trans-title-group xml:lang="ru"><trans-title>Вопросы вирусологии</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0507-4088</issn><issn publication-format="electronic">2411-2097</issn><publisher><publisher-name xml:lang="en">Central Research Institute for Epidemiology</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">16825</article-id><article-id pub-id-type="doi">10.36233/0507-4088-358</article-id><article-id pub-id-type="edn">dsmlna</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>ORIGINAL RESEARCHES</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">Detection of Yezo virus (<italic>Nairoviridae, Orthonairovirus, Orthonairovirus yezoense</italic>) circulation in <italic>Ixodes persulcatus</italic> ticks in the Amur Region, Russia</article-title><trans-title-group xml:lang="ru"><trans-title>Выявление циркуляции Yezo virus (<italic>Nairoviridae, Orthonairovirus, Orthonairovirus yezoense</italic>) в клещах <italic>Ixodes persulcatus</italic> на территории Амурской области</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-7857-6822</contrib-id><name-alternatives><name xml:lang="en"><surname>Kartashov</surname><given-names>Mikhail Yu.</given-names></name><name xml:lang="ru"><surname>Карташов</surname><given-names>Михаил Юрьевич</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Ph.D. (Biol.), Leading Researcher, Head of the Molecular Diagnostics Sector</p></bio><bio xml:lang="ru"><p>канд. биол. наук, ведущий научный сотрудник отдела молекулярной вирусологии, заведующий сектором молекулярной диагностики </p></bio><email>mikkartash@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0005-8148-5242</contrib-id><name-alternatives><name xml:lang="en"><surname>Kurushina</surname><given-names>Valentina Yu.</given-names></name><name xml:lang="ru"><surname>Курушина</surname><given-names>Валентина Юрьевна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Junior Researcher, Department of Molecular Virology</p></bio><bio xml:lang="ru"><p>стажер-исследователь отдела молекулярной вирусологии </p></bio><email>kurushina.valenti@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0006-1252-9616</contrib-id><name-alternatives><name xml:lang="en"><surname>Zheleznova</surname><given-names>Alina S.</given-names></name><name xml:lang="ru"><surname>Железнова</surname><given-names>Алина Сергеевна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Junior Researcher, Department of Molecular Virology</p></bio><bio xml:lang="ru"><p>стажер-исследователь отдела молекулярной вирусологии </p></bio><email>zheleznova_as@vector.nsc.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-9083-1649</contrib-id><name-alternatives><name xml:lang="en"><surname>Svirin</surname><given-names>Kirill A.</given-names></name><name xml:lang="ru"><surname>Свирин</surname><given-names>Кирилл Андреевич</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Junior Researcher, Department of Molecular Virology</p></bio><bio xml:lang="ru"><p>младший научный сотрудник отдела молекулярной вирусологии </p></bio><email>svirin_ka@vector.nsc.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-5181-0415</contrib-id><name-alternatives><name xml:lang="en"><surname>Materikina</surname><given-names>Ekaterina I.</given-names></name><name xml:lang="ru"><surname>Материкина</surname><given-names>Екатерина Ильинична</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Researcher, Department of Molecular Virology</p></bio><bio xml:lang="ru"><p>научный сотрудник отдела молекулярной вирусологии </p></bio><email>katr962@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-1275-171X</contrib-id><name-alternatives><name xml:lang="en"><surname>Ternovoi</surname><given-names>Vladimir A.</given-names></name><name xml:lang="ru"><surname>Терновой</surname><given-names>Владимир Александрович</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Ph.D. (Biol.), Leading Researcher, Head of the Laboratory of Molecular Epidemiology</p></bio><bio xml:lang="ru"><p>канд. биол. наук, ведущий научный сотрудник отдела молекулярной вирусологии, заведующий лабораторией молекулярной эпидемиологии </p></bio><email>tern@vector.nsc.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">State Research Center of Virology and Biotechnology «Vector»</institution></aff><aff><institution xml:lang="ru">ФБУН «Государственный научный центр вирусологии и биотехнологии «Вектор» Федеральной службы по надзору в сфере защиты прав потребителей и благополучия человека (Роспотребнадзор)</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2026-03-23" publication-format="electronic"><day>23</day><month>03</month><year>2026</year></pub-date><volume>71</volume><issue>1</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>53</fpage><lpage>61</lpage><history><date date-type="received" iso-8601-date="2025-11-12"><day>12</day><month>11</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2026, Kartashov M.Y., Kurushina V.Y., Zheleznova A.S., Svirin K.A., Materikina E.I., Ternovoi V.A.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2026, Карташов М.Ю., Курушина В.Ю., Железнова А.С., Свирин К.А., Материкина Е.И., Терновой В.А.</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="en">Kartashov M.Y., Kurushina V.Y., Zheleznova A.S., Svirin K.A., Materikina E.I., Ternovoi V.A.</copyright-holder><copyright-holder xml:lang="ru">Карташов М.Ю., Курушина В.Ю., Железнова А.С., Свирин К.А., Материкина Е.И., Терновой В.А.</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/><license><ali:license_ref xmlns:ali="http://www.niso.org/schemas/ali/1.0/">https://creativecommons.org/licenses/by/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://virusjour.crie.ru/jour/article/view/16825">https://virusjour.crie.ru/jour/article/view/16825</self-uri><abstract xml:lang="en"><p><bold>Introduction. </bold>The unfavorable epidemiological situation with viral tick-borne infections can be characterized not only by an increase in the incidence of «classical», well-known diseases, but also by the discovery of new pathogens, the role of which remains poorly understood. <italic>Yezo virus</italic> (YEZV) belongs to the group of recently discovered tick-borne nairoviruses. YEZV circulation is characteristic of Japan, China, and a number of regions in Russia (Primorsky, Khabarovsk, and Zabaykalsky Krais; Tomsk Oblast).</p> <p>The<bold> aim </bold>of the study was to screen and characterize the molecular genetics of YEZV isolated from ticks in the Amur region.</p> <p><bold>Materials and methods.</bold> In the study, 704 individual tick samples (463 <italic>I. persulcatus</italic> ticks and 241 <italic>H. concinna</italic> ticks) collected from vegetation in 15 locations in 5 districts of the Amur Region were analyzed for the presence of YEZV RNA. Full-length genomic sequencing of the identified YEZV genetic variant was performed by preliminary enrichment of YEZV cDNA using multiplex PCR with a primer panel developed by us.</p> <p><bold>Results.</bold> The YEZV infection rate in the studied sample of <italic>I. persulcatus</italic> ticks was 0.2% (1/463; 95% CI: 0.1–1.2).</p> <p><bold>Conclusion.</bold> The results of this study expand our understanding of the spread of YEZV in Russia. Up-to-date information on the circulation and genetic diversity of nairoviruses that pose a potential threat to humans and animals contributes to the regulation and adjustment of preventive and anti-epidemic measures, as well as the implementation of adequate region-oriented laboratory diagnostics of IPK in the Far East, and especially in areas bordering China.</p></abstract><trans-abstract xml:lang="ru"><p><bold>Введение.</bold> Неблагополучная эпидемиологическая ситуация с вирусными инфекциями, переносимыми клещами (ИПК), может характеризоваться не только ростом встречаемости уже известных заболеваний, но и выявлением новых возбудителей, роль которых пока остается малоизученной. К группе недавно открытых наировирусов, переносимых клещами, относится <italic>Yezo virus</italic> (YEZV). Циркуляция YEZV характерна для Японии, Китая и ряда регионов России (Приморский, Хабаровский, Забайкальский края, Томская область).</p> <p><bold>Цель </bold>работысостояла в доказательстве циркуляции на территории Амурской области недавно открытого наировируса - YEZV, а также его молекулярно-генетической характеристике путем определения полногеномной нуклеотидной последовательности выявленного генетического варианта YEZV.</p> <p><bold>Материалы и методы.</bold> В исследовании на наличие РНК YEZV проанализированы 704 индивидуальные пробы клещей (463 клеща вида <italic>Ixodes persulcatus</italic> и 241 клещ вида <italic>Haemaphysalis concinna</italic>), отловленных с растительности в 15 локациях, расположенных в 5 районах Амурской области. Проведено секвенирование полноразмерной геномной последовательности выявленного генетического варианта YEZV путем предварительного обогащения кДНК YEZV методом мультиплексной полимеразной цепной реакции с использованием разработанной нами панели праймеров.</p> <p><bold>Результаты.</bold> Уровень инфицированности YEZV в исследуемой выборке клещей <italic>I. persulcatus</italic> составил 0,2% (1/463; 95% ДИ 0,1–1,2).</p> <p><bold>Заключение.</bold> Полученные данные расширяют представления о распространении YEZV на территории России. Актуальная информация о циркуляции и генетическом разнообразии наировирусов, представляющих потенциальную опасность для человека и животных, способствует регулированию и корректировке профилактических и противоэпидемических мероприятий, а также проведению адекватной регионально-ориентированной лабораторной диагностики ИПК на территории Дальнего Востока, и прежде всего в приграничных с Китаем областях.</p></trans-abstract><kwd-group xml:lang="en"><kwd>Orthonairovirus</kwd><kwd>Yezo virus</kwd><kwd>YEZV</kwd><kwd>ixodid ticks</kwd><kwd>Amur Region</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>наировирусы</kwd><kwd>вирус Йезо</kwd><kwd>YEZV</kwd><kwd>иксодовые клещи</kwd><kwd>Амурская область</kwd></kwd-group><funding-group><award-group><funding-source><institution-wrap><institution xml:lang="en">Ministry of Science and Higher Education of the Russian Federation</institution></institution-wrap><institution-wrap><institution xml:lang="ru">Министерство науки и высшего образования Российской Федерации</institution></institution-wrap></funding-source><award-id>075-15-2025-526</award-id></award-group><funding-statement xml:lang="en">This study was supported by the Ministry of Science and Higher Education of the Russian Federation (agreement No. 075-15-2019-1665).</funding-statement><funding-statement xml:lang="ru">Исследование было выполнено при поддержке Министерства науки и высшего образования Российской Федерации (соглашение № 075-15-2025-526).</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Georgakopoulou V.E., Taskou C., Sarantaki A., Spandidos D.A., Gourounti K., Chaniotis D., et al. 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