{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,18]],"date-time":"2026-08-18T04:55:12Z","timestamp":1787028912373,"version":"build-2736575974"},"reference-count":29,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2023,7,28]],"date-time":"2023-07-28T00:00:00Z","timestamp":1690502400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Medicina"],"abstract":"<jats:p>Background and objective: Acinetobacter baumannii (A.\u00a0baumannii) is an important nosocomial pathogen that not only possesses intrinsic resistance to many classes of antibiotics, but is also capable of rapidly developing antimicrobial resistance during treatment. The aim of this study was to determine the characteristics of resistance of A.\u00a0baumannii strains to \u03b2-lactams and other tested antibiotics, to evaluate the associations between the phenotypes of resistance to \u03b2-lactams and other tested antibiotics, and to evaluate the changes in antibiotic resistance of A.\u00a0baumannii strains over 5 years by comparing the periods of 2016\u20132017 and 2020\u20132021. Materials and methods: A total of 233 A. baumannii strains were isolated from different clinical specimens of patients treated at the Hospital of Lithuanian University of Health Sciences in 2016\u20132017 (n = 130) and 2021\u20132022 (n = 103). All clinical cultures positive for A.\u00a0baumannii were analyzed. The type of \u03b2-lactamase was detected by phenotypic methods using ESBL plus AmpC screen disk tests and the combination meropenem disk test. Results: In both periods, all A.\u00a0baumannii strains were resistant to ciprofloxacin; resistance to carbapenems, piperacillin\/tazobactam, gentamicin, and tobramycin was noted in more than 80% of strains. A comparison of two periods showed that the percentages of A.\u00a0baumannii strains producing two or three types of \u03b2-lactamases were significantly greater in 2021\u20132022 than in 2016\u20132017 (94.2% and 5.8% vs. 17.7% and 2.3%, respectively, p &lt; 0.001). Isolates producing two or three types of \u03b2-lactamases were more often resistant to tigecycline, tetracycline, and doxycycline than strains producing one type of \u03b2-lactamase (p &lt; 0.001). Conclusions: The frequency of isolation of A.\u00a0baumannii strains producing two different types of \u03b2-lactamases (AmpC plus KPC, AmpC plus ESBL, or ESBL plus KPC) or three types of \u03b2-lactamases (AmpC, KPC, and ESBL) and the resistance rates to ampicillin\/sulbactam, tigecycline, tetracycline, and doxycycline were significantly greater in 2020\u20132021 as compared with 2016\u20132017. The production of two or three types of \u03b2-lactamases by A.\u00a0baumannii strains was associated with higher resistance rates to tetracyclines.<\/jats:p>","DOI":"10.3390\/medicina59081386","type":"journal-article","created":{"date-parts":[[2023,7,31]],"date-time":"2023-07-31T01:28:46Z","timestamp":1690766926000},"page":"1386","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Associations between \u03b2-Lactamase Types of Acinetobacter baumannii and Antimicrobial Resistance"],"prefix":"10.3390","volume":"59","author":[{"given":"Kristina","family":"\u010cerniauskien\u0117","sequence":"first","affiliation":[{"name":"Department of Laboratory Medicine, Faculty of Medicine, Medical Academy, Lithuanian University of Health Science, Eiveni\u0173 g. 2, LT-50161 Kaunas, Lithuania"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Asta","family":"Dambrauskien\u0117","sequence":"additional","affiliation":[{"name":"Department of Laboratory Medicine, Faculty of Medicine, Medical Academy, Lithuanian University of Health Science, Eiveni\u0173 g. 2, LT-50161 Kaunas, Lithuania"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Astra","family":"Vitkauskien\u0117","sequence":"additional","affiliation":[{"name":"Department of Laboratory Medicine, Faculty of Medicine, Medical Academy, Lithuanian University of Health Science, Eiveni\u0173 g. 2, LT-50161 Kaunas, Lithuania"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2023,7,28]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"649","DOI":"10.1309\/LM90IJNDDDWRI3RE","article-title":"A Review of Acinetobacter baumannii as a Highly Successful Pathogen in Times of War","volume":"41","author":"Camp","year":"2010","journal-title":"Lab. 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