Molecular epidemiology and clinical significance of carbapenemase genes in carbapenem-resistant Acinetobacter baumannii isolates in southern Poland

A complex interplay between Acinetobacter spp., patients, and the environment has made it increasingly difficult to optimally treat patients infected with Acinetobacter spp., mainly due to rising antimicrobial resistance and challenges with surveillance. This study evaluated carbapenem‑resistant A....

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Published in:	Polskie archiwum medycyny wewne̦trznej Vol. 134; no. 6
Main Authors:	Serwacki, Piotr A, Hareza, Dariusz A, Kujawska, Anna, Pałka, Anna, Jachowicz-Matczak, Estera, Rybka-Grymek, Agata, Świątek-Kwapniewska, Wioletta, Pawłowska, Iwona, Gniadek, Zofia, Gutkowska, Karolina, Gajda, Mateusz, Wójkowska-Mach, Jadwiga
Format:	Journal Article
Language:	English
Published:	Poland 27-06-2024
Subjects:	Acinetobacter baumannii - drug effects Acinetobacter baumannii - genetics Acinetobacter Infections - drug therapy Acinetobacter Infections - epidemiology Acinetobacter Infections - microbiology Adult Aged Anti-Bacterial Agents - pharmacology Anti-Bacterial Agents - therapeutic use Bacterial Proteins - genetics beta-Lactamases - genetics Carbapenems - pharmacology Carbapenems - therapeutic use Clinical Relevance Cross Infection - drug therapy Cross Infection - epidemiology Cross Infection - microbiology Female Humans Male Microbial Sensitivity Tests Middle Aged Molecular Epidemiology Poland - epidemiology Poland
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Summary:	A complex interplay between Acinetobacter spp., patients, and the environment has made it increasingly difficult to optimally treat patients infected with Acinetobacter spp., mainly due to rising antimicrobial resistance and challenges with surveillance. This study evaluated carbapenem‑resistant A. baumannii (CRAB) isolates to determine their resistance profiles and the presence of specific β‑lactamases to inform CRAB surveillance upon hospital admission and regional empiric antibiotic therapies. The study was conducted at 4 hospitals in southern Poland between June and December 2022. Only health care-associated infections caused by A. baumannii were considered. A total of 82 CRAB isolates were included in the analysis. Species identification was performed by matrix‑assisted laser desorption / ionization time‑of‑flight mass spectrometry, antimicrobial susceptibility was determined phenotypically, and polymerase chain reactions were carried out to identify the resistance genes. Depending on the hospital, the incidence of CRAB infections varied from 428.6 to 759.5 per 10 000 admissions in intensive care units (ICUs), and from 0.3 to 21 per 10 000 admissions in non‑ICUs. CRAB antibiotic susceptibility was the highest for cefiderocol (100%), colistin (96%), tigecycline (77%), gentamicin (51%), and ampicillin / sulbactam (36%). The most prevalent blaOXA genes were blaOXA‑66‑1 (95%) and blaOXA‑40 (71%), and additionally the extended‑spectrum β‑lactamase gene blaTEM‑1 (41%). An unexpectedly high incidence of CRAB infections occurred in Polish hospitals. There is a need for effective CRAB prevention and control that includes effective hospital screening, national surveillance, and improved treatment options.
ISSN:	1897-9483
DOI:	10.20452/pamw.16734