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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">Epidemiology and Infectious Diseases</journal-id><journal-title-group><journal-title xml:lang="en">Epidemiology and Infectious Diseases</journal-title><trans-title-group xml:lang="ru"><trans-title>Эпидемиология и инфекционные болезни</trans-title></trans-title-group></journal-title-group><issn publication-format="print">3034-2007</issn><issn publication-format="electronic">3034-2015</issn><publisher><publisher-name xml:lang="en">Eco-Vector</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">52959</article-id><article-id pub-id-type="doi">10.17816/EID52959</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Case reports</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Клинические случаи</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">The combined course of COVID-19 and influenza: clinical presentation, diagnosis, treatment</article-title><trans-title-group xml:lang="ru"><trans-title>Сочетанное течение COVID-19 и гриппа: клиническая картина, диагностика, лечение</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-5053-0312</contrib-id><contrib-id contrib-id-type="spin">7290-8377</contrib-id><name-alternatives><name xml:lang="en"><surname>Poluektova</surname><given-names>Viktoriya B.</given-names></name><name xml:lang="ru"><surname>Полуэктова</surname><given-names>Виктория Борисовна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>PhD, docent</p></bio><bio xml:lang="ru"><p>к.м.н., доцент</p></bio><email>viktoriya211@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-0521-4502</contrib-id><contrib-id contrib-id-type="spin">8451-5845</contrib-id><name-alternatives><name xml:lang="en"><surname>Burdova</surname><given-names>Elena Yu.</given-names></name><name xml:lang="ru"><surname>Бурдова</surname><given-names>Елена Юрьевна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>ellenburdov@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-1874-9103</contrib-id><contrib-id contrib-id-type="spin">9065-4087</contrib-id><name-alternatives><name xml:lang="en"><surname>Filatova</surname><given-names>Anastasia P.</given-names></name><name xml:lang="ru"><surname>Филатова</surname><given-names>Анастасия Петровна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>sklif@zdrav.mos.ru</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-7343-0667</contrib-id><contrib-id contrib-id-type="spin">5097-5585</contrib-id><name-alternatives><name xml:lang="en"><surname>Ladygina</surname><given-names>Elena A.</given-names></name><name xml:lang="ru"><surname>Ладыгина</surname><given-names>Елена Александровна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>sklif@zdrav.mos.ru</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-5185-0748</contrib-id><name-alternatives><name xml:lang="en"><surname>Litvinova</surname><given-names>Elizaveta P.</given-names></name><name xml:lang="ru"><surname>Литвинова</surname><given-names>Елизавета Павловна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>infection_mma@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-6157-1654</contrib-id><contrib-id contrib-id-type="spin">4790-8986</contrib-id><name-alternatives><name xml:lang="en"><surname>Malov</surname><given-names>Valeri A.</given-names></name><name xml:lang="ru"><surname>Малов</surname><given-names>Валерий Анатольевич</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>MD, PhD, Professor</p></bio><bio xml:lang="ru"><p>д.м.н., профессор</p></bio><email>infection_mma@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-1945-323X</contrib-id><contrib-id contrib-id-type="spin">4255-4720</contrib-id><name-alternatives><name xml:lang="en"><surname>Popugaev</surname><given-names>Konstantin A.</given-names></name><name xml:lang="ru"><surname>Попугаев</surname><given-names>Константин Александрович</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>MD, PhD</p></bio><bio xml:lang="ru"><p>д.м.н.</p></bio><email>sklif@zdrav.mos.ru</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-4581-4510</contrib-id><contrib-id contrib-id-type="spin">3342-4681</contrib-id><name-alternatives><name xml:lang="en"><surname>Volchkova</surname><given-names>Elena V.</given-names></name><name xml:lang="ru"><surname>Волчкова</surname><given-names>Елена Васильевна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>MD, PhD, Professor</p></bio><bio xml:lang="ru"><p>д.м.н., профессор</p></bio><email>infection_mma@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-3292-8789</contrib-id><name-alternatives><name xml:lang="en"><surname>Petrikov</surname><given-names>Sergey S.</given-names></name><name xml:lang="ru"><surname>Петриков</surname><given-names>Сергей Сергеевич</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>MD, PhD, Professor, corresponding member of RAS</p></bio><bio xml:lang="ru"><p>д.м.н., профессор, чл.-корр РАН</p></bio><email>sklif@zdrav.mos.ru</email><xref ref-type="aff" rid="aff2"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">I.M. Sechenov First Moscow State Medical University (Sechenov University)</institution></aff><aff><institution xml:lang="ru">Первый Московский государственный медицинский университет имени И.М. Сеченова (Сеченовский Университет)</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Research Institute of Emergency Medicine named after N.V. Sklifosovsky</institution></aff><aff><institution xml:lang="ru">Научно-исследовательский институт скорой помощи имени Н.В. Склифосовского</institution></aff></aff-alternatives><pub-date date-type="preprint" iso-8601-date="2020-12-30" publication-format="electronic"><day>30</day><month>12</month><year>2020</year></pub-date><pub-date date-type="pub" iso-8601-date="2020-06-15" publication-format="electronic"><day>15</day><month>06</month><year>2020</year></pub-date><volume>25</volume><issue>3</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>132</fpage><lpage>138</lpage><history><date date-type="received" iso-8601-date="2020-12-03"><day>03</day><month>12</month><year>2020</year></date><date date-type="accepted" iso-8601-date="2020-12-15"><day>15</day><month>12</month><year>2020</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2020, Eco-vector</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2020, ООО "Эко-вектор"</copyright-statement><copyright-year>2020</copyright-year><copyright-holder xml:lang="en">Eco-vector</copyright-holder><copyright-holder xml:lang="ru">ООО "Эко-вектор"</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/></permissions><self-uri xlink:href="https://rjeid.com/1560-9529/article/view/52959">https://rjeid.com/1560-9529/article/view/52959</self-uri><abstract xml:lang="en"><p>The new coronavirus infection severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) during the natural epidemic rise of respiratory infections can occur in combination with them. This report aimed to answer the question that arises regarding features of clinical and laboratory diagnostic characteristics of mixed infections. A group of patients was analyzed with combined course of acute coronavirus infection SARS-CoV-2 and influenza using clinical and laboratory instrumental data. Attention is drawn to the fact that combined course of these nosologies, characterized by a significant decrease in blood oxygen saturation with atmospheric air breathing and moderately pronounced changes of the chest organs according to computed tomography results goes together with a moderate course of the disease. Absolute lymphopenia and high C-reactive protein and fibrinogen levels may be specific markers that confirm viral etiology of this disease. At the same time, high titer of antibodies to SARS-CoV-2 did not always correspond to the full elimination of coronavirus from the body in patients with mixed infection.</p></abstract><trans-abstract xml:lang="ru"><p>Новая коронавирусная инфекция SARS-CoV-2 в период естественного эпидемического подъёма респираторных инфекций может протекать в сочетании с ними. Встаёт вопрос об особенностях, клинических и лабораторно диагностических характеристиках микст-инфекций, что и является целью данного сообщения. Мы проанализировали группу пациентов с сочетанным течением острой коронавирусной инфекции SARS-CoV-2 и гриппа, используя клинические и лабораторно инструментальные данные. Обращает внимание, что сочетанное течение указанных нозологий характеризуется значительным снижением сатурации кислорода в крови при дыхании на атмосферном воздухе, по результатам компьютерной томографии — умеренно выраженными изменениями органов грудной клетки при среднетяжёлой форме болезни. Абсолютная лимфопения, высокие показатели С-реактивного белка и уровня фибриногена могут являться специфическими маркерами, подтверждающими вирусную этиологию заболевания. В то же время высокий титр антител к SARS-CoV-2 не всегда соответствует полноценной элиминации коронавируса из организма у пациентов с микст-инфекцией.</p></trans-abstract><kwd-group xml:lang="en"><kwd>SARS-CoV-2</kwd><kwd>SARS-CoV-2 infection antibody testing</kwd><kwd>SARS-CoV-2 infection nucleic acid testing</kwd><kwd>influenza</kwd><kwd>respiratory</kwd><kwd>X-Ray Computed Tomography</kwd><kwd>case report</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>SARS-CoV-2</kwd><kwd>SARS-CoV-2-антитела</kwd><kwd>РНК Coronavirus COVID-19</kwd><kwd>грипп</kwd><kwd>респираторная поддержка</kwd><kwd>компьютерная томография</kwd><kwd>клинические случаи</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><citation-alternatives><mixed-citation xml:lang="en">Pinky L, Dobrovolny HM. SARS-CoV-2 coinfections: could influenza and the common cold be beneficial? 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