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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">17665</article-id><article-id pub-id-type="doi">10.15789/2220-7619-NKP-17665</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">Nosocomial <italic>Klebsiella pneumoniae</italic> infection in a cardiac surgery hospital: clinical and microbiological features</article-title><trans-title-group xml:lang="ru"><trans-title>Нозокомиальная инфекция <italic>Klebsiella pneumoniae</italic> в кардиохирургическом стационаре: клинико-микробиологические особенности</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kuznetsova</surname><given-names>M. V.</given-names></name><name xml:lang="ru"><surname>Кузнецова</surname><given-names>Марина Валентиновна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>DSc (Medicine), Leading Researcher, Laboratory of Molecular Biotechnology</p></bio><bio xml:lang="ru"><p>д.м.н., ведущий научный сотрудник лаборатории молекулярной биотехнологии</p></bio><email>mar@iegm.ru</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Mihailovskaya</surname><given-names>V. S.</given-names></name><name xml:lang="ru"><surname>Михайловская</surname><given-names>В. C.</given-names></name></name-alternatives><bio xml:lang="en"><p>Engineer, Laboratory of Molecular Biotechnology; Master</p></bio><bio xml:lang="ru"><p>инженер лаборатории молекулярной биотехнологии; магистр</p></bio><email>mar@iegm.ru</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff3"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kudryavtseva</surname><given-names>L. G.</given-names></name><name xml:lang="ru"><surname>Кудрявцева</surname><given-names>Л. Г.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>PhD (Medicine), Head of the Epidemiological Department, Doctor-Epidemiologist</p></bio><bio xml:lang="ru"><p>к.м.н., врач-эпидемиолог, зав. эпидемиологическим отделом</p></bio><email>mar@iegm.ru</email><xref ref-type="aff" rid="aff4"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Sergevnin</surname><given-names>V. I.</given-names></name><name xml:lang="ru"><surname>Сергевнин</surname><given-names>В. И.</given-names></name></name-alternatives><bio xml:lang="en"><p>DSc (Medicine), Professor, Department of Epidemiology and Hygiene</p></bio><bio xml:lang="ru"><p>д.м.н., профессор кафедры эпидемиологии и гигиены</p></bio><email>mar@iegm.ru</email><xref ref-type="aff" rid="aff2"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Institute of Ecology and Genetics of Microorganisms Ural Branch Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Институт экологии и генетики микроорганизмов УрО РАН — филиал Пермского федерального исследовательского центра УрО РАН</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Perm State Medical University named after academician E.A. Wagner</institution></aff><aff><institution xml:lang="ru">ФГБОУ ВО Пермский государственный медицинский университет имени академика Е.А. Вагнера Минздрава России</institution></aff></aff-alternatives><aff-alternatives id="aff3"><aff><institution xml:lang="en">Sirius University of Science and Technology</institution></aff><aff><institution xml:lang="ru">АНО ВО Научно-технологический университет «Сириус»</institution></aff></aff-alternatives><aff-alternatives id="aff4"><aff><institution xml:lang="en">Cardiovascular Surgery Federal Center named after S.G. Sukhanov Ministry of Health of the Russian Federation</institution></aff><aff><institution xml:lang="ru">ФГБУ Федеральный центр сердечно-сосудистой хирургии имени С.Г. Суханова Минздрава России</institution></aff></aff-alternatives><pub-date date-type="preprint" iso-8601-date="2024-10-21" publication-format="electronic"><day>21</day><month>10</month><year>2024</year></pub-date><pub-date date-type="pub" iso-8601-date="2024-12-25" publication-format="electronic"><day>25</day><month>12</month><year>2024</year></pub-date><volume>14</volume><issue>6</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>1117</fpage><lpage>1130</lpage><history><date date-type="received" iso-8601-date="2024-05-16"><day>16</day><month>05</month><year>2024</year></date><date date-type="accepted" iso-8601-date="2024-08-13"><day>13</day><month>08</month><year>2024</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2024, Kuznetsova M.V., Mihailovskaya V.S., Kudryavtseva L.G., Sergevnin V.I.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2024, Кузнецова М.В., Михайловская В.C., Кудрявцева Л.Г., Сергевнин В.И.</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="en">Kuznetsova M.V., Mihailovskaya V.S., Kudryavtseva L.G., Sergevnin V.I.</copyright-holder><copyright-holder xml:lang="ru">Кузнецова М.В., Михайловская В.C., Кудрявцева Л.Г., Сергевнин В.И.</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/17665">https://iimmun.ru/iimm/article/view/17665</self-uri><abstract xml:lang="en"><p><italic>Klebsiella pneumoniae</italic> dominates among the pathogens that cause healthcare-associated infections and closely associated with high mortality of patients undergoing heart surgery. <italic>K. pneumoniae</italic> spp. are classified into classical (cKp) and hypervirulent (hvKp): cKp causing nosocomial infections often exerting a multidrug resistance phenotype (MDR-cKp), whereas hvKp are sensitive to antibiotics, but have high virulence. Earlier, we presented the molecular genetic characteristics of <italic>K. pneumoniae</italic> bacteria isolated from patients at the cardiac surgical hospital. Here, clinical and microbiological risk factors as well as thoase underlying infection development and adverse outcome of nosocomial infection caused by <italic>K. pneumoniae</italic> were evaluated. Along with initially severe comorbidities, the most significant risk factors were the following: female gender, age over 65 years, length of stay at the Department of Anesthesiology and Intensive Care as well as other detected comorbidities. The average length of stay was 1.7 times longer among MDR-cKp vs hvKp patients. Complications (multiple organ dysfunction syndrome, bloodstream infections), as well as mortality rate were recorded only in MDR-cKp patient group. Thus, in hospital period, <italic>K. pneumoniae</italic> multidrug resistance rather than hypervirulence turned out to be a more contributing risk factor. It should be noted that one convergent MDR-hvKp isolate has been detected, which may pose a serious problem in treatment of patients upon further spread of such <italic>K. pneumoniae</italic> bacteria.</p></abstract><trans-abstract xml:lang="ru"><p><italic>Klebsiella pneumoniae</italic> занимает доминирующее положение в структуре возбудителей инфекций, связанных с оказанием медицинской помощи, и ассоциирована с высокой смертностью пациентов, оперированных по поводу заболеваний сердечно-сосудистой системы. <italic>K. pneumoniae</italic> классифицируют на классические (cKp) и гипервирулентные (hvKp): cKp вызывают нозокомиальные инфекции и часто имеют фенотип множественной лекарственной устойчивости (MDR-cKp), тогда как hvKp чувствительны к антибиотикам, но обладают высокой вирулентностью. Ранее была представлена молекулярно-генетическая характеристика изолятов <italic>K. pneumoniae</italic>, выделенных от пациентов кардиохирургического стационара. В данной работе проведена оценка клинических и микробиологических факторов риска, развития и неблагоприятного исхода нозокомиальной инфекции, вызванной <italic>K. pneumoniae</italic>. На фоне исходно тяжелого коморбидного состояния пациентов наиболее значимыми факторами риска оказались: женский пол, возраст старше 65 лет, длительность пребывания в отделении анестезиологии и реанимации и наличие сопутствующего заболевания. Средняя продолжительность пребывания в стационаре была в 1,7 раз выше у пациентов, инфицированных MDR-cKp, чем при инфицировании hvKp. Осложнения инфекции (полиорганная недостаточность, инфекции кровотока), как и летальные исходы, были подтверждены только в группе пациентов с инфекцией MDR-cKp. Таким образом, в госпитальном периоде более существенным фактором риска оказалась множественная лекарственная устойчивость, чем гипервирулентность <italic>K. pneumoniae</italic>. Необходимо отметить, что был обнаружен один конвергентный изолят MDR-hvKp, что может представлять серьезную проблему в лечении пациентов при дальнейшем распространении таких <italic>K. pneumoniae</italic>.</p></trans-abstract><kwd-group xml:lang="en"><kwd>Klebsiella pneumoniae</kwd><kwd>cardiac surgery hospital</kwd><kwd>multiresistance</kwd><kwd>hypervirulence</kwd><kwd>nosocomial infections</kwd><kwd>risk factors</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>Klebsiella pneumoniae</kwd><kwd>кардиохирургический стационар</kwd><kwd>мультирезистентность</kwd><kwd>гипервирулентность</kwd><kwd>нозокомиальные инфекции</kwd><kwd>факторы риска</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Агеевец В.A., Агеевец И.В., Сидоренко С.В. Конвергенция множественной резистентности и гипервирулентности у Кlebsiella pneumoniae // Инфекция и иммунитет. 2022. Т. 12, № 3. С. 450–460. 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