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CHARACTERISTICS OF RESPIRATORY TRACT BACTERIAL MICROFLORA DETECTED IN PATIENTS SUFFERING FROM COMMUNITY-ACQUIRED PNEUMONIA DURING CONTINUING SPREAD OF THE NEW CORONAVIRUS INFECTION IN KHABAROVSK CITY (DECEMBER 2020 — MARCH 2021).
Russian Journal of Infection & Immunity ; 12(4):713-725, 2022.
Article in Russian | Academic Search Complete | ID: covidwho-2040487
ABSTRACT
Objective of the research — to specify respiratory tract bacterial microflora in patients suffering from community-acquired pneumonia (CAP) during initial and repeat examination. To determine local factors affecting microflora in the cohort examined. Materials and methods. Surveillance subject — 241 patients with CAP differed by their status and age who stayed in two healthcare facilities of the Khabarovsk city. Examination of respiratory smears was performed. Results. Indices of Gram-negative enterobacteria (30.8% [22.6–39.7%]) and Gram-negative nonfermentable bacteria (14.5% [8.6–21.7%]), isolated from patients hospitalized in healthcare institution No. 1 and mostly comprised of the elderly (aged over 61 years — 82.0%;74.3–88.6%) with more severe disease state including patients at the ICU, were higher compared to data obtained from healthcare institution No. 2 (19.8% (13.4–27.0);6.1% (2.7–10.8) respectively). Prevalent pathogen was Klebsiella pneumoniae — 13.6% (7.8–20.6) and 10.7% (6.0–16.5). Identification of Acinetobacter baumannii complex — 6.4% (2.6–11.7) and 3.1% (0.8–6.7) — should be also noted. A high percentage of drug-resistant bacterial variants was observed and for Klebsiella pneumoniae totaled 66.7% (41.8–87.4) and 57.1% (32.2–80.2) at the healthcare institutions No. 1 and No. 2, respectively. A. baumannii complex drug resistant variants were found in 85.7% (52.7–99.97) at healthcare institution No. 1. All isolates of A. baumannii complex at the healthcare institution No. 2 were drug resistant. High prevalence of Candida spp. was revealed in both healthcare institutions reaching 54.5% (45.2–63.7) and 58.0% (49.5–66.3), respectively, with minimal detection rate of classic pathogens such as S. pneumoniae — 5.4% (2.0–10.4) and 5.3% (2.1–9.8) and H. influenzae — 3.6% (0.9–7.9) and 3.8% (1.2–7.7), respectively. Repeat examination of 122 patients conducted 7–10 days later showed diverse changes in microflora spectrum regardless of the healthcare institution that was manifested as loss or emergence of drug-resistant variants as well as simultaneous presence of different variants of the same pathogen. Conclusion. The results obtained evidence about complexity and variety of mechanisms underlying microorganism community formation during the course of infectious process in patients. Local factors influencing microflora characteristics of patients at the two healthcare institutions were revealed. (English) [ FROM AUTHOR] Цель исследования — определить бактериальную микрофлору респираторного тракта больных внебольничной пневмонией (ВП) при их первичном и повторном обследовании, выявить локальные факторы, влияющие на показатели микрофлоры у наблюдаемого контингента. Объект наблюдения — 241 больной ВП из двух лечебных учреждений г. Хабаровска, различающихся по статусу и возрастному составу пациентов. Исследованы респираторные мазки. В ЛПУ № 1, в котором сосредоточены пациенты старше 61 года — 82,0% (74,3–88,6) с более тяжелым течением болезни, в том числе пациенты РАО, показатели выявления грамотрицательных энтеробактерий — 30,8% (22,6–39,7) и неферментирующих грамотрицательных бактерий — 14,5% (8,6–21,7) были выше по сравнению с ЛПУ № 2 — 19,8% (13,4–27,0) и 6,1% (2,7–10,8) соответственно группам возбудителей. Ведущий возбудитель в обоих ЛПУ — Klebsiella pneumoniae — 13,6% (7,8–20,6) и 10,7% (6,0–16,5). Следует отметить регистрацию Acinetobacter baumannii complex — 6,4% (2,6–11,7) и 3,1% (0,8–6,7). Характерна высокая доля участия лекарственноустойчивых вариантов — 66,7% (41,8–87,4) и 57,1% (32,2–80,2) для K. pneumoniae, в ЛПУ № 1 и ЛПУ № 2 соответственно, и для A. baumannii complex — в ЛПУ № 1 их вклад составил 85,7% (52,7–99,97), в ЛПУ № 2 все изоляты имели лекарственную устойчивость. В обоих ЛПУ у больных отмечены высокие показатели выявления грибов рода Candida — 54,5% (45,2–63,7) и 58,0% (49,5–66,3) соответственно, и минимальные уровни классических возбудителей S. pneumoniae — 5,4% (2,0–10,4) и 5,3% (2,1–9,8) и H. influenzae — 3,6% (0,9–7,9) и 3,8% (1,2–7,7) соответственно. Через 7–10 дней при повторном обследовании 122 больных отмечено разнонаправленное из менение микрофлоры, независимое от статуса ЛПУ, и проявляющееся как по линии утраты лекарственноустойчивых вариантов, так и в приобретении их или одновременном присутствии разных вариантов одного возбудителя. Полученные результаты свидетельствуют о сложности и множественности механизмов формирования популяции микроорганизмов в динамике инфекционного процесса у больного. Выявлены локальные факторы, влияющие на показатели микрофлоры больных в двух лечебных учреждениях. 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Full text: Available Collection: Databases of international organizations Database: Academic Search Complete Language: Russian Journal: Russian Journal of Infection & Immunity Year: 2022 Document Type: Article

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Full text: Available Collection: Databases of international organizations Database: Academic Search Complete Language: Russian Journal: Russian Journal of Infection & Immunity Year: 2022 Document Type: Article