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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" article-type="research-article" dtd-version="1.1d1" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher">Problems of Social Hygiene, Public Health and History of Medicine</journal-id><journal-title-group><journal-title>Problems of Social Hygiene, Public Health and History of Medicine</journal-title></journal-title-group><issn publication-format="print">0869-866X</issn><issn publication-format="electronic">2412-2106</issn><publisher><publisher-name>Joint-Stock Company Chicot</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">2725</article-id><article-id pub-id-type="doi">10.32687/0869-866X-2026-34-3-662-667</article-id><article-categories><subj-group subj-group-type="heading"><subject>Научная статья</subject></subj-group></article-categories><title-group><article-title>THE CHARACTERISTICS OF HIV-INFECTION MORBIDITY OF PATIENTS AGED 45 YEARS AND OLDER IN MODERN EPIDEMIOLOGICAL CONDITIONS</article-title></title-group><contrib-group><contrib contrib-type="author"><name name-style="western"><surname>Tsybikova</surname><given-names>E. B.</given-names></name><email></email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author"><name name-style="western"><surname>Kotlovskiy</surname><given-names>M. Yu.</given-names></name><email></email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author"><name name-style="western"><surname>Fadeeva</surname><given-names>S. O.</given-names></name><email></email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author"><name name-style="western"><surname>Zakharova</surname><given-names>M. V.</given-names></name><email></email><xref ref-type="aff" rid="aff-3"/></contrib></contrib-group><aff id="aff-1">N. A. Semashko National Research Institute of Public Health, 105064, Moscow, Russia</aff><aff id="aff-2">The State Budgetary Institution "The Moscow Municipal Scientific Practical Center of Tuberculosis Control" of the Moscow Health Care Department, 107014, Moscow, Russia</aff><aff id="aff-3">The Federal State Budgetary Educational Institution of Higher Education "The K. E. Tsiolkovsky Kaluga State University", 248023, Kaluga, Russia</aff><pub-date date-type="epub" iso-8601-date="2026-07-07" publication-format="electronic"><day>07</day><month>07</month><year>2026</year></pub-date><volume>34</volume><issue>3</issue><fpage>662</fpage><lpage>667</lpage><history><pub-date date-type="received" iso-8601-date="2026-07-07"><day>07</day><month>07</month><year>2026</year></pub-date></history><permissions><copyright-statement>Copyright © 2026,</copyright-statement><copyright-year>2026</copyright-year></permissions><abstract>In many countries, the number of people of elderly cohort is steadily increasing. It is expected that over 2015–2050, the percentage of the worlds population older than 60 years will increase twice, from 12% to 22%. With increasing of life expectancy, the problem of HIV infection among persons of elderly cohort will gain greater importance, since by 2030 it is assumed that 70% of people with HIV infection will be aged 50 years and older.</abstract><kwd-group xml:lang="en"><kwd>elderly cohort</kwd><kwd>morbidity</kwd><kwd>HIV-infection</kwd><kwd>persons aged 45 years and older</kwd><kwd>newly identified patients</kwd><kwd>cartographic methods</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>старшая возрастная когорта</kwd><kwd>заболеваемость</kwd><kwd>ВИЧ-инфекция</kwd><kwd>лица в возрасте 45 лет и старше</kwd><kwd>впервые выявленные пациенты</kwd><kwd>картографические методы</kwd></kwd-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Lopreite M., Misuraca M., Puliga M. An analysis of the thematic evolution of ageing and healthcare expenditure using word embedding. Socio-Econ. Plan. 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