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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">16873</article-id><article-id pub-id-type="doi">10.36233/0507-4088-378</article-id><article-id pub-id-type="edn">pevzzn</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>TO VIROLOGIST’S AID</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>В ПОМОЩЬ ВИРУСОЛОГУ</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">Immunochromatographic analysis of canine parvovirus (<italic>Parvoviridae</italic>: <italic>Protoparvovirus</italic>)</article-title><trans-title-group xml:lang="ru"><trans-title>Иммунохроматографический анализ парвовируса собак (<italic>Parvoviridae</italic>: <italic>Protoparvovirus</italic>)</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-8602-6599</contrib-id><name-alternatives><name xml:lang="en"><surname>Varlamov</surname><given-names>Nikolay E.</given-names></name><name xml:lang="ru"><surname>Варламов</surname><given-names>Николай Евгеньевич</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Researcher, Laboratory of Biocollection and Antibody-Based Preparations</p></bio><bio xml:lang="ru"><p>научный сотрудник лаборатории биоколлекции и препаратов на основе антител</p></bio><email>n.varlamov@ronc.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0000-2292-8537</contrib-id><name-alternatives><name xml:lang="en"><surname>Ryzhikov</surname><given-names>Mikhail A.</given-names></name><name xml:lang="ru"><surname>Рыжиков</surname><given-names>Михаил Александрович</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Laborant Researcher, Laboratory of Biocollection and Antibody-Based Preparations; Postgraduate Student</p></bio><bio xml:lang="ru"><p>лаборант-исследователь лаборатории биоколлекции и препаратов на основе антител; аспирант </p></bio><email>m.ryzhikov@ronc.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/0009-0003-7210-2882</contrib-id><name-alternatives><name xml:lang="en"><surname>Serebryakova</surname><given-names>Natalya Y.</given-names></name><name xml:lang="ru"><surname>Серебрякова</surname><given-names>Наталья Юрьевна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Researcher, Laboratory of Biocollection and Antibody-Based Preparations</p></bio><bio xml:lang="ru"><p>научный сотрудник лаборатории биоколлекции и препаратов на основе антител</p></bio><email>n.serebrjakova@ronc.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-0218-8265</contrib-id><name-alternatives><name xml:lang="en"><surname>Gusev</surname><given-names>Dmitriy V.</given-names></name><name xml:lang="ru"><surname>Гусев</surname><given-names>Дмитрий Васильевич</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Cand. Sci. (Chem.), Head of the Laboratory of Chemical Synthesis</p></bio><bio xml:lang="ru"><p>канд. хим. наук, заведующий лабораторией химического синтеза</p></bio><email>d.gusev@ronc.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0009-7115-7797</contrib-id><name-alternatives><name xml:lang="en"><surname>Sadovskaya</surname><given-names>Yana O.</given-names></name><name xml:lang="ru"><surname>Садовская</surname><given-names>Яна Олеговна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Junior Researcher, Laboratory of Biocollection and Antibody-Based Preparations</p></bio><bio xml:lang="ru"><p>младший научный сотрудник лаборатории биоколлекции и препаратов на основе антител</p></bio><email>ja.sadovskaja@ronc.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0008-6104-5233</contrib-id><name-alternatives><name xml:lang="en"><surname>Khotuleva</surname><given-names>Margarita G.</given-names></name><name xml:lang="ru"><surname>Хотулева</surname><given-names>Маргарита Геннадьевна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Laborant Researcher, Laboratory of Biocollection and Antibody-Based Preparations</p></bio><bio xml:lang="ru"><p>лаборант-исследователь лаборатории биоколлекции и препаратов на основе антител</p></bio><email>m.khotuleva@ronc.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0000-0317-9948</contrib-id><name-alternatives><name xml:lang="en"><surname>Karimova</surname><given-names>Anastasia O.</given-names></name><name xml:lang="ru"><surname>Каримова</surname><given-names>Анастасия Олеговна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Junior Researcher, Laboratory of Biocollection and Antibody-Based Preparations; Postgraduate Student</p></bio><bio xml:lang="ru"><p>младший научный сотрудник лаборатории биоколлекции и препаратов на основе антител; аспирант</p></bio><email>a.karimova@ronc.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/0000-0002-5465-6094</contrib-id><name-alternatives><name xml:lang="en"><surname>Solopova</surname><given-names>Olga N.</given-names></name><name xml:lang="ru"><surname>Солопова</surname><given-names>Ольга Николаевна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Cand. Sci. (Biol.), Head of the Laboratory of Biocollection and Antibody-Based Preparations</p></bio><bio xml:lang="ru"><p>канд. биол. наук, заведующая лабораторией биоколлекции и препаратов на основе антител</p></bio><email>o.solopova@ronc.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-1403-8520</contrib-id><name-alternatives><name xml:lang="en"><surname>Ivanov</surname><given-names>Pavel K.</given-names></name><name xml:lang="ru"><surname>Иванов</surname><given-names>Павел Константинович</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>D. Sci. (Med.), Leading Researcher, Laboratory of Biocollection and Antibody-Based Preparations</p></bio><bio xml:lang="ru"><p>д-р мед. наук, ведущий научный сотрудник лаборатории биоколлекции и препаратов на основе антител</p></bio><email>p.ivanov@ronc.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">N.N. Blokhin National Medical Research Center of Oncology</institution></aff><aff><institution xml:lang="ru">ФГБУ «Национальный медицинский исследовательский центр онкологии им. Н.Н. Блохина» Минздрава России</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">National Research University Higher School of Economics</institution></aff><aff><institution xml:lang="ru">ФГАОУ ВО «Национальный исследовательский университет «Высшая школа экономики»</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2026-06-30" publication-format="electronic"><day>30</day><month>06</month><year>2026</year></pub-date><volume>71</volume><issue>3</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>284</fpage><lpage>295</lpage><history><date date-type="received" iso-8601-date="2026-03-31"><day>31</day><month>03</month><year>2026</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2026, Varlamov N.E., Ryzhikov M.A., Serebryakova N.Y., Gusev D.V., Sadovskaya Y.O., Khotuleva M.G., Karimova A.O., Solopova O.N., Ivanov P.K.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2026, Варламов Н.Е., Рыжиков М.А., Серебрякова Н.Ю., Гусев Д.В., Садовская Я.О., Хотулева М.Г., Каримова А.О., Солопова О.Н., Иванов П.К.</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="en">Varlamov N.E., Ryzhikov M.A., Serebryakova N.Y., Gusev D.V., Sadovskaya Y.O., Khotuleva M.G., Karimova A.O., Solopova O.N., Ivanov P.K.</copyright-holder><copyright-holder xml:lang="ru">Варламов Н.Е., Рыжиков М.А., Серебрякова Н.Ю., Гусев Д.В., Садовская Я.О., Хотулева М.Г., Каримова А.О., Солопова О.Н., Иванов П.К.</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/16873">https://virusjour.crie.ru/jour/article/view/16873</self-uri><abstract xml:lang="en"><p><bold>Introduction. </bold>Infection of canids with canine parvovirus (CPV), especially in puppies, leads to serious damage to the gastrointestinal tract in a short period of time, up to a fatal outcome. In this regard, early and rapid diagnosis is crucial for initiating therapy and preventing the spread of infection. In this connection, immunochromatographic analysis (ICA) is the preferred method because it allows rapid detection of virus infection. In addition, this method is highly specific and does not require complex laboratory equipment, which greatly simplifies its use in comparison with other common methods for detecting canine parvovirus.</p> <p><bold>The aim </bold>of this study is the development of an ICA test system for the detection of the VP2 protein of canine parvovirus.</p> <p><bold>Materials and methods. </bold>Monoclonal antibodies to the recombinant VP2 protein of canine parvovirus were obtained using hybridomic technology. Colloidal gold is synthesized by the citrate method.</p> <p><bold>Results. </bold>Monoclonal antibodies (MABs) against the VP2 protein of canine parvovirus were obtained and characterized, colloidal gold (AuNPs) was synthesized, the conditions for conjugation of MABs with AuNPs were selected, and the optimal ratios of the components of the test system were determined. The visual limit detection (vLOD) was 1.56 ng/mL. The developed ICA test system has shown high diagnostic efficiency in model experiments with a known concentration of VP2, as well as in sick animals with a confirmed diagnosis.</p> <p><bold>Conclusion. </bold>An ICA test system has been developed to determine the VP2 protein of canine parvovirus. The resulting test system can be used as a fast and effective diagnostic tool for detecting CVP in the canine clinical specimens.</p></abstract><trans-abstract xml:lang="ru"><p><bold>Введение.</bold> Инфицирование псовых собачьим парвовирусом (CPV), в особенности у щенков, приводит к серьезным повреждениям желудочно-кишечного тракта за короткий промежуток времени, вплоть до летального исхода. В связи с этим ранняя и быстрая диагностика имеет решающее значение для начала терапии и предупреждения распространения инфекции. В этом отношении иммунохроматографический анализ (ИХА) является предпочтительным методом, поскольку позволяет оперативно выявить инфицирование вирусом. Кроме того, этот метод отличается высокой специфичностью и не требует сложного лабораторного оборудования, что значимо упрощает его применение в сравнении с другими распространенными методами обнаружения парвовируса собак.</p> <p><bold>Цель работы.</bold> Разработка ИХА-тест-системы для определения белка VP2 собачьего парвовируса.</p> <p><bold>Материалы и методы. </bold>Методом гибридомной технологии получены моноклональные антитела (МкАТ) к рекомбинантному белку VP2 парвовируса собак. Коллоидное золото (КЗ) синтезировано цитратным методом.</p> <p><bold>Результаты.</bold> Были получены и охарактеризованы МкАТ против белка VP2 парвовируса собак, синтезировано КЗ, подобраны условия конъюгации МкАТ с КЗ, а также определены оптимальные соотношения компонентов тест-системы. Был выявлен наблюдаемый предел обнаружения (vLOD), который составил 1,56 нг/мл. Разработанная ИХА-тест-система показала высокую диагностическую эффективность в модельных экспериментах с известной концентрацией VP2, а также у больных животных с подтвержденным диагнозом.</p> <p><bold>Заключение.</bold> Разработана ИХА-тест-система для определения белка VP2 парвовируса собак. Полученная тест-система может быть использована в качестве быстрого и эффективного диагностического средства для выявления CVP в клиническом материале собак.</p></trans-abstract><kwd-group xml:lang="en"><kwd>ICA test system</kwd><kwd>test strips</kwd><kwd>canine parvovirus (CPV)</kwd><kwd>monoclonal antibodies (MABs)</kwd><kwd>colloidal gold (AuNPs)</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>ИХА-тест-система</kwd><kwd>тест-полоски</kwd><kwd>парвовирус собак (CPV)</kwd><kwd>моноклональные антитела (МкАТ)</kwd><kwd>коллоидное золото (КЗ)</kwd></kwd-group><funding-group><award-group><funding-source><institution-wrap><institution xml:lang="en">Applegen LLC</institution></institution-wrap><institution-wrap><institution xml:lang="ru">ООО «Эпплген»</institution></institution-wrap></funding-source></award-group><funding-statement xml:lang="en">The study was funded by Applegen, the manufacturer of the ICA QBQVET tests</funding-statement><funding-statement xml:lang="ru">Исследование выполнено за счет средств производителя ИХА-тестов QBQVET компании «Эпплген»</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Mazzaferro E.M. 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