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Copyright of Chinese Journal of Applied Ecology / Yingyong Shengtai Xuebao is the property of Chinese Journal of Applied Ecology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The spread of antibiotic-resistant bacteria is a global problem that should be addressed through the perspective of the "one health" concept. The purpose of this study was to determine the contamination rate of antibiotic-resistant Aeromonas spp. in fresh water river fish purchased from a fish market in Vietnam. We then defined the pattern of antibiotic resistance to assess antibiotic-resistant contamination. Antibiotic-resistant Aeromonas spp. were detected in the intestinal contents of 32 of 80 fish. bla NDM-1 was detected in seven strains. Extended-spectrum β-lactamase and AmpC β-lactamase-related genes were detected in 28 strains, including bla CTX-M-55 , bla CTX-M-15 , bla CTX-M-1 , and bla DHA, bla FOX, and bla MOX. The bla NDM-1 detected in the seven Aeromonas spp. strains were found chromosomally. This finding suggests that the bla NDM gene is stable in the natural environment and may spread widely into animals and humans via Aeromonas spp. with a transposon. Our results suggest the importance of continuing to monitor carbapenemase genes in Aeromonas spp. to evaluate the possibility that they may spread in other Enterobacterales , and to elucidate the mechanism of spread. • bla NDM-1 -carrying Aeromonas spp. was isolated from the intestinal contents of fish. • Our results suggest the importance of continuing to monitor carbapenemase-related genes in Aeromonas spp. • bla NDM-1 of Aeromonas spp. was present on chromosome. [ABSTRACT FROM AUTHOR]