Genomic characterization of an Acinetobacter baumannii ST25/International Clone 7 isolate carrying a resistance-associated plasmid from wild-caught oysters in the Southeastern USA.

Authors

Issmat I Kassem, Jouman W Hassan, Nivin Nasser, Tongzhou Xu, David Mann, Xiangyu Deng

Published in

Marine pollution bulletin. Volume 233. Issue Pt 3. Pages 120420. Oct 06, 2026. Epub Oct 06, 2026.

Abstract

Oysters are filter feeders that bioaccumulate microorganisms and other contaminants from water. Therefore, screening oysters facilitates monitoring of emerging antimicrobial-resistant pathogens in these habitats. Here, we report an in-depth genomic characterization of an antibiotic-resistant Acinetobacter baumannii that was isolated from a wild-caught oyster. Multilocus Sequence Typing (MLST) analyses assigned the strain to the ST25^IP (Pasteur Scheme Sequence Type), which belongs to a lineage associated with antibiotic-resistance and epidemics. The strain was found to be antibiotic-resistant and carried multiple antibiotic resistance genes. Notably, four antibiotic resistance genes were located on a mobilizable plasmid that shared >99% sequence identity with plasmids reported internationally (Lebanon, Germany, Mexico, and Taiwan). Furthermore, using in-silico analyses, the isolate was predicted to be a potential human pathogen that harbored multiple virulence-associated genes. To our knowledge, this is the first report of an antibiotic-resistant A. baumannii (ST25^IP) in oysters in the USA.

PMID:
42837935
Bibliographic data and abstract were imported from PubMed on 07 Oct 2026.

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