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Multiple mechanisms mediate aztreonam-avibactam resistance in Klebsiella pneumoniae: driven by KPC-2 and OmpK36 mutations.
Int J Antimicrob Agents
December 2024
Department of Clinical Laboratory, Key Laboratory of Clinical Laboratory Diagnosis and Translational Research of Zhejiang Province, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang Province, China. Electronic address:
Aztreonam-avibactam (ATM-AVI) is a promising β-lactam/β-lactamase inhibitor combination with an antimicrobial spectrum covering serine carbapenemase- or metallo-β-lactamase-producing Enterobacterales. Although ATM-AVI has not been widely used in clinical practice, resistance to it in Escherichia coli has been widely reported. In this study, we investigated an ATM-AVI-resistant Klebsiella pneumoniae strain, designated as 1705R, derived from K.
View Article and Find Full Text PDFOne Health distribution of beta-lactamases in Enterobacterales in the United States: A systematic review and meta-analysis.
Int J Antimicrob Agents
December 2024
Texas Tech University School of Veterinary Medicine, Amarillo, TX 79106, United States. Electronic address:
Background: The study aimed to review the beta-lactamase resistance genes detected in Enterobacterales from humans, animals, and the environment in the United States.
Methods: We conducted a comprehensive search on PubMed, Web of Science, and Google Scholar for articles reporting beta-lactamase genes in the United States from 1981 to 22 April 2022, following the PRISMA protocol. Studies were evaluated based on predefined eligibility criteria, and both qualitative and quantitative analyses were conducted on the selected studies.
Identification of beta-lactamase genes and molecular genotyping of multidrug-resistant clinical isolates of Klebsiella pneumoniae.
BMC Microbiol
December 2024
Department of Microbiology, Faculty of Medicine, Shahed University, Tehran, Iran.
Background: Klebsiella pneumoniae is a clinically relevant pathogen that has raised considerable public health concerns. This study aims to determine the presence of beta-lactamase genes and perform molecular genotyping of multidrug-resistant (MDR) K. pneumoniae clinical isolates.
View Article and Find Full Text PDFSilent circulation of plasmid-borne tet(X6) and bla genes in a community-acquired Acinetobacter baumannii strain.
Drug Resist Updat
December 2024
Department of Clinical Laboratory, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, China; Key Laboratory of Precision Medicine in Diagnosis and Monitoring Research of Zhejiang Province, Hangzhou, China. Electronic address:
To characterize the genomic features of a community-acquired Acinetobacter baumannii strain, co-carrying tet(X6) and bla genes, but was susceptible to tigecycline and carbapenems. The tet(X6) and bla genes were found on a 149,518 bp non-conjugative plasmid. The bla gene was silent, due to the presence of an intact ISAba3-like element upstream, which rendered the strain susceptible to carbapenems.
View Article and Find Full Text PDFCharacterization of non-typhoidal Salmonella reveals the highly prevalent mcr-1-positive S. 1,4,[5],12:i:- within eggs are derived from chickens.
Int J Food Microbiol
December 2024
College of Veterinary Medicine, Qingdao Agricultural University, Qingdao 266109, China. Electronic address:
Salmonella is one of the most common foodborne pathogens. Antimicrobial-resistant Salmonella isolates, especially those resistant to colistin, pose a significant threat to public health worldwide. However, data about the prevalence of mcr-positive Salmonella in animals was few and the dissemination of mcr-positive Salmonella from animals to food, especially eggs, has not been fully addressed.
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