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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">Russian Journal of Infection and Immunity</journal-id><journal-title-group><journal-title xml:lang="en">Russian Journal of Infection and Immunity</journal-title><trans-title-group xml:lang="ru"><trans-title>Инфекция и иммунитет</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2220-7619</issn><issn publication-format="electronic">2313-7398</issn><publisher><publisher-name xml:lang="en">SPb RAACI</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">18018</article-id><article-id pub-id-type="doi">10.15789/2220-7619-EAC-18018</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>ORIGINAL ARTICLES</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>ОРИГИНАЛЬНЫЕ СТАТЬИ</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">Epidemiology and clinical features of severe imported falciparum malaria among adults upon hospital admission: a four-year retrospective single-center study in Moscow, Russia</article-title><trans-title-group xml:lang="ru"><trans-title>Ретроспективный анализ случаев тяжелой завозной тропической малярии у взрослых пациентов: клинико-эпидемиологическая характеристика на момент госпитализации</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-0636-2710</contrib-id><name-alternatives><name xml:lang="en"><surname>Emerole</surname><given-names>Karl Ch.</given-names></name><name xml:lang="ru"><surname>Эмероле</surname><given-names>Карл Чуквуемека</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>PhD (Medicine), Associate Professor, Department of Infectious Diseases, Epidemiology and Phthisiology</p></bio><bio xml:lang="ru"><p>к.м.н., доцент кафедры инфекционных болезней с курсами эпидемиологии и фтизиатрии</p></bio><email>emerole_k@pfur.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Bogdanova</surname><given-names>Maria V.</given-names></name><name xml:lang="ru"><surname>Богданова</surname><given-names>Мария Владимировна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Infectious Disease Physician, 4th Infectious Disease Department</p></bio><bio xml:lang="ru"><p>врач-инфекционист инфекционного отделения № 4</p></bio><email>bolnica2@yandex.ru</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Vellynance</surname><given-names>Mvuania N.</given-names></name><name xml:lang="ru"><surname>Веллинансе</surname><given-names>Мвуаниа Н.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>PhD Student, Department of Infectious Diseases, Epidemiology and Phthisiology</p></bio><bio xml:lang="ru"><p>аспирант кафедры инфекционных болезней с курсами эпидемиологии и фтизиатрии</p></bio><email>vellynancentonde@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Peoples' Friendship University of Russia (RUDN University)</institution></aff><aff><institution xml:lang="ru">ФГАОУ ВО Российский университет дружбы народов (РУДН)</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Infectious Diseases Clinical Hospital No. 2 , Moscow</institution></aff><aff><institution xml:lang="ru">ГБУЗ Инфекционная клиническая больница № 2 Департамента здравоохранения города Москвы</institution></aff></aff-alternatives><pub-date date-type="preprint" iso-8601-date="2026-01-27" publication-format="electronic"><day>27</day><month>01</month><year>2026</year></pub-date><pub-date date-type="pub" iso-8601-date="2026-06-01" publication-format="electronic"><day>01</day><month>06</month><year>2026</year></pub-date><volume>16</volume><issue>2</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>326</fpage><lpage>334</lpage><history><date date-type="received" iso-8601-date="2025-09-22"><day>22</day><month>09</month><year>2025</year></date><date date-type="accepted" iso-8601-date="2026-01-05"><day>05</day><month>01</month><year>2026</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2026, Emerole K.C., Bogdanova M.V., Vellynance M.N.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2026, Эмероле К.Ч., Богданова М.В., Веллинансе М.Н.</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="en">Emerole K.C., Bogdanova M.V., Vellynance M.N.</copyright-holder><copyright-holder xml:lang="ru">Эмероле К.Ч., Богданова М.В., Веллинансе М.Н.</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://iimmun.ru/iimm/article/view/18018">https://iimmun.ru/iimm/article/view/18018</self-uri><abstract xml:lang="en"><p><bold>Background.</bold> Despite being malaria-free, Russia still yet faces numerous annual imported cases, predominantly life-threatening <italic>P. falciparum</italic> from Africa. For non-immune travelers, delays in diagnosis in non-endemic countries are a major risk factor for severe disease and mortality. This study aimed to characterize the epidemiological patterns of imported severe malaria cases and investigate the most common serious clinical presentations observed at the time of hospital admission. Understanding these patterns would contribute to improved patient care and treatment protocols. <bold>Materials and methods.</bold> The medical records of all imported severe malaria cases at the Infectious Diseases State Hospital No. 2 Moscow from 2020 to 2023, were retrospectively evaluated in this single-center investigation. <bold>Results.</bold> 32 patients were identified with severe imported malaria, as defined by the World Health Organization (WHO). The median age was 41 years (IQR 36–52), 89% of which were male. Most of the cases (91.2%) cases were among individuals of Russian origin. Nearly all participants acquired infection in sub-Saharan Africa countries. No patient used malaria chemoprophylaxis before, during or after visit to these countries, with median time from symptom onset to presentation comprising five days (IQR 4–6). All, 100% (32/32) severe malaria cases were caused by <italic>Plasmodium falciparum</italic> species. At the time of hospital admission, hyper parasitemia (99%), impaired consciousness (98%), prostration (78.1%), and jaundice (52%) were the most frequent findings as described by the WHO criteria for severe malaria. <bold>Conclusion.</bold> The findings emphasize the crucial role that antimalarial medication and prompt medical attention play in both preventing malaria and mitigating its severity. Prompt diagnosis and treatment of falciparum malaria is crucial, as delays in identification can lead to more severe illness. Our investigation also highlights the necessity to improve pre-travel consulting procedures.</p></abstract><trans-abstract xml:lang="ru"><p><bold>Введение.</bold> Хотя малярия не является эндемичным заболеванием для России, ежегодно в стране регистрируются многочисленные завозные случаи инфекции. Наиболее эпидемиологически значимыми являются опасные для жизни формы малярии, вызванные <italic>Plasmodium falciparum</italic>, которые преимущественно завозится из стран Африки. Для неиммунных путешественников ключевым фактором риска развития тяжелых осложнений и летальных исходов становится отсроченная диагностика заболевания в неэндемичных регионах, где у медицинских работников может отсутствовать настороженность в отношении клинических проявлений тропических болезней. На основе анализа зарегистрированных случаев обобщить клинико-эпидемиологические особенности завозной тяжелой малярии для повышения диагностической настороженности врачей. <bold>Материалы и методы.</bold> Проведен анализ историй болезни больных с тяжелой falciparum малярией, которые проходили лечение в отделениях ГБУЗ Инфекционной клинической больницы № 2 г. Москвы (ИКБ № 2) с 2020 по 2023 г. <bold>Результаты. </bold>В выборку вошли 32 пациента, соответствовавших критериям тяжелой малярии по ВОЗ. Средний возраст — 41 год, большинство (89%, n = 28) составили мужчины. Практически все случаи (91,2%) зафиксированы у граждан РФ. Пациенты подверглись заражению во время пребывания в эндемичных странах Центральной и Западной Африки. Никто из наблюдавшихся лиц не проводил химиопрофилактику малярии. Среднее время между появлением симптомов и госпитализацией — 5 дней. Во всех случаях возбудителем была <italic>Plasmodium falciparum</italic>. Наиболее частыми критериями тяжести при поступлении были: гиперпаразитемия (99%), нарушение сознания (98%), прострация (78,1%) и желтуха (52%). <bold>Выводы.</bold> Анализ проведенных наблюдений свидетельствует о том, что в начальном периоде falciparum малярии ряд симптомов требует дифференциации с другими острыми инфекционными болезнями. Быстрая диагностика и незамедлительное начало лечения инфекции, вызванной <italic>P. falciparum</italic>, являются критически важными для исхода, так как любое промедление чревато развитием осложнений. Исследование также свидетельствует о необходимости усиления мер предвыездного консультирования туристов, направляющихся в эндемичные зоны.</p></trans-abstract><kwd-group xml:lang="en"><kwd>imported malaria</kwd><kwd>severe malaria</kwd><kwd>Plasmodium falciparum</kwd><kwd>non-endemic setting</kwd><kwd>non-immune travelers</kwd><kwd>clinical spectrum</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>завозная малярия</kwd><kwd>тяжелая малярия</kwd><kwd>Plasmodium falciparum</kwd><kwd>неэндемичная среда</kwd><kwd>неиммунные путешественники</kwd><kwd>клиническая картина</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Antinori S., Giacomelli A., Casalini G., Ridolfo A.L. How to manage adult patients with malaria in the non-endemic setting. Clin. Microbiol. 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