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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">ppharm</journal-id><journal-title-group><journal-title xml:lang="ru">Педиатрическая фармакология</journal-title><trans-title-group xml:lang="en"><trans-title>Pediatric pharmacology</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1727-5776</issn><issn pub-type="epub">2500-3089</issn><publisher><publisher-name>Издательство «ПедиатрЪ»</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.15690/pf.v23i2.3028</article-id><article-id custom-type="elpub" pub-id-type="custom">ppharm-2789</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>КЛИНИЧЕСКИЙ СЛУЧАЙ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>CASE REPORT</subject></subj-group></article-categories><title-group><article-title>Опыт применения генно-инженерного биологического препарата при гиперэозинофильном синдроме у ребенка, перенесшего коронавирусную инфекцию (обзор литературы и описание клинического случая)</article-title><trans-title-group xml:lang="en"><trans-title>Experience with a Genetically Engineering Biological Agent in a Child with Hypereosinophilic Syndrome Following Coronavirus Infection: Literature Review and Case Report</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-2290-0013</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Балыкова</surname><given-names>Л. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Balykova</surname><given-names>Larisa A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Балыкова Лариса Александровна, член-корреспондент РАН, доктор медицинских наук, профессор, проректор по инновационной деятельности в сфере биотехнологии и медицины </p><p>430005, г. Саранск, ул. Большевистская, д. 68 </p><p>тел.: +7 (927) 276-10-64 </p></bio><bio xml:lang="en"><p>MD, PhD, Professor, Corresponding Member of the RAS </p><p>Saransk </p><p>68, Bolshevistskaya Str., Saransk, 430005 </p></bio><email xlink:type="simple">larisabalykova@yandex.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>Краснопольская</surname><given-names>А. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Krasnopolskaya</surname><given-names>Anna V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Краснопольская Анна Валерьевна, к.м.н.  </p><p>Саранск </p></bio><bio xml:lang="en"><p>MD, PhD </p><p>Saransk </p></bio><email xlink:type="simple">abalykova@gmail.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/0000-0003-2927-3224</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Верещагина</surname><given-names>В. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Vereshchagina</surname><given-names>Veronika S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Верещагина Вероника Сергеевна, к.м.н., доцент </p><p>Саранск  </p></bio><bio xml:lang="en"><p>MD, PhD, Associate Professor </p><p>Saransk </p></bio><email xlink:type="simple">versver@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/0000-0002-9049-5662</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Ширманкина</surname><given-names>М. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Shirmankina</surname><given-names>Marina V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Ширманкина Марина Васильевна  </p><p>Саранск </p></bio><bio xml:lang="en"><p>MD </p><p>Saransk </p></bio><email xlink:type="simple">shirmankina99@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/0009-0009-6581-1211</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Пигачева</surname><given-names>О. Ю.</given-names></name><name name-style="western" xml:lang="en"><surname>Pigacheva</surname><given-names>Olga Yu.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Пигачева Ольга Юрьевна </p><p>Саранск </p></bio><bio xml:lang="en"><p>MD </p><p>Saransk </p></bio><email xlink:type="simple">oyupigacheva@rambler.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/0009-0004-8555-4578</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Страдина</surname><given-names>А. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Stradina</surname><given-names>Anna A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Страдина Анна Александровна </p><p>Саранск </p></bio><bio xml:lang="en"><p>MD </p><p>Saransk </p></bio><email xlink:type="simple">anna1988strad@icloud.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/0000-0001-5452-0018</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Ледяйкина</surname><given-names>С. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Ledyaykina</surname><given-names>Svetlana A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Ледяйкина Светлана Александровна </p><p>Саранск </p></bio><bio xml:lang="en"><p>MD </p><p>Saransk </p></bio><email xlink:type="simple">thanekrios@inbox.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Национальный исследовательский Мордовский государственный университет им. Н.П. Огарёва</institution><country>Россия</country></aff><aff xml:lang="en"><institution>N.P. Ogarev National Research Mordovia State University</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2026</year></pub-date><pub-date pub-type="epub"><day>31</day><month>05</month><year>2026</year></pub-date><volume>23</volume><issue>2</issue><elocation-id>62–71</elocation-id><permissions><copyright-statement>Copyright &amp;#x00A9; Балыкова Л.А., Краснопольская А.В., Верещагина В.С., Ширманкина М.В., Пигачева О.Ю., Страдина А.А., Ледяйкина С.А., 2026</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="ru">Балыкова Л.А., Краснопольская А.В., Верещагина В.С., Ширманкина М.В., Пигачева О.Ю., Страдина А.А., Ледяйкина С.А.</copyright-holder><copyright-holder xml:lang="en">Balykova L.A., Krasnopolskaya A.V., Vereshchagina V.S., Shirmankina M.V., Pigacheva O.Y., Stradina A.A., Ledyaykina S.A.</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.pedpharma.ru/jour/article/view/2789">https://www.pedpharma.ru/jour/article/view/2789</self-uri><abstract><p>Обоснование. Гиперэозинофильный синдром (ГЭС) — гетерогенная группа заболеваний, для которой характерны эозинофильная инфильтрация тканей и широкий спектр клинических проявлений. Остается открытым вопрос о патогенетической терапии данного состояния, поскольку часть пациентов рефрактерны к традиционному лечению. Описание клинического случая. В статье рассмотрены основные проблемы дифференциальной диагностики и современные подходы к лечению ГЭС в педиатрической практике, а также представлен редкий клинический случай первичного ГЭС у ребенка 14 лет. После проведения тщательного диагностического поиска и подтверждения диагноза пациентке была назначена терапия системными глюкокортикоидами, давшая временный эффект. Однако в дальнейшем, учитывая развитие тяжелого обострения при попытке отмены гормональной терапии, было инициировано лечение меполизумабом — гуманизированным моноклональным антителом к рецептору интерлейкина 5. Заключение. Ведение пациентов с ГЭС нередко представляет значительные трудности, что связано с полиморфизмом клинических проявлений, необходимостью исключения широкого спектра заболеваний и возможной рефрактерностью к стандартной терапии. Применение генно-инженерного биологического препарата продемонстрировало высокую эффективность, позволив преодолеть зависимость от глюкокортикоидов и предотвратить развитие их побочных эффектов.</p></abstract><trans-abstract xml:lang="en"><p>Hypereosinophilic syndrome (HES) is a heterogeneous group of disorders characterized by tissue eosinophilic infiltration and a wide spectrum of clinical manifestations. The issue of pathogenetic therapy for this condition remains unresolved, as some patients are refractory to conventional treatment. Case report. This article discusses the main challenges of differential diagnosis and current approaches to the treatment of HES in pediatric practice, and presents a rare clinical case of primary HES in a 14yearold girl. After a thorough diagnostic workup and confirmation of the diagnosis, the patient received systemic glucocorticoid therapy, which produced a temporary effect. However, due to the development of a severe exacerbation upon attempted withdrawal of hormonal therapy, treatment with mepolizumab — a humanized monoclonal antibody against the interleukin5 receptor — was initiated. Conclusion. The management of patients with HES often presents significant difficulties due to the polymorphism of clinical manifestations, the need to rule out a wide range of diseases, and possible refractoriness to standard therapy. The usage of this genetically engineered biological agent demonstrated high efficacy, enabling the patient to overcome glucocorticoid dependence and prevent the development of glucocorticoid-related adverse effects.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>гиперэозинофильный синдром</kwd><kwd>генно-инженерная биологическая терапия</kwd><kwd>моноклональные антитела</kwd><kwd>меполизумаб</kwd><kwd>клинический случай</kwd><kwd>дети</kwd></kwd-group><kwd-group xml:lang="en"><kwd>hypereosinophilic syndrome</kwd><kwd>genetically engineered biological therapy</kwd><kwd>monoclonal antibodies</kwd><kwd>mepolizumab</kwd><kwd>clinical case</kwd><kwd>children</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Отсутствует.</funding-statement><funding-statement xml:lang="en">Not specified.</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Gotlib I. 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