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Summary   Aeromonas hydrophila  and  Aeromonas caviae  adapt to saline water environments and are the most predominant  Aeromonas  species isolated from estuaries. Here, we isolated antimicrobial‐resistant (AMR)  Aeromonas  strains ( A. hydrophila  GSH8‐2 and  A. caviae  GSH8M‐1) carrying the carabapenemase  bla  KPC‐2  gene from a wastewater treatment plant (WWTP) effluent in Tokyo Bay (Japan) and determined their complete genome sequences. GSH8‐2 and GSH8M‐1 were classified as newly assigned sequence types ST558 and ST13, suggesting no supportive evidence of clonal dissemination. The strains appear to have acquired  bla  KPC‐2 ‐positive IncP‐6‐relative plasmids (pGSH8‐2 and pGSH8M‐1‐2) that share a common backbone with plasmids in  Aeromonas  sp. ASNIH3 isolated from hospital wastewater in the United States,  A. hydrophila  WCHAH045096 isolated from sewage in China, other clinical isolates ( Klebsiella ,  Enterobacter  and  Escherichia coli ), and wastewater isolates ( Citrobacter ,  Pseudomonas  and other  Aeromonas  spp.). In addition to  bla  KPC‐2 , pGSH8M‐1‐2 carries an IS 26 ‐mediated composite transposon including a macrolide resistance gene,  mph (A). Although  Aeromonas  species are opportunistic pathogens, they could serve as potential environmental reservoir bacteria for carbapenemase and AMR genes. AMR monitoring from WWTP effluents will contribute to the detection of ongoing AMR dissemination in the environment and might provide an early warning of potential dissemination in clinical settings and communities.

environmental microbiology reports

Potential KPC‐2 carbapenemase reservoir of environmental  Aeromonas hydrophila  and  Aeromonas caviae  isolates from the effluent of an urban wastewater treatment plant in Japan