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The bla has been reported in Central Asia and Europe countries like Afghanistan and France in PAC-1 has been reported in Central Asia and Europe countries like Afghanistan and France in Aeromonas caviae and Pseudomonas aeruginosa strains from animals and patients, respectively. However, there is no record of bla PAC-1 has not been reported in the Asia Pacific. Here, we report the first known enviromental bla PAC-1 -carrying Aeromonas has not been reported in the Asia Pacific. Here, we report the first known enviromental bla PAC-1 -carrying Aeromonas enteropelogenes in the world from reservoir water in Singapore. We have performed a comprehensive genetic environment alignment and comparison of bla PAC-1 in the Asia-Pacific region, involving multiple sources and different species.bla PAC-1 located on a highly conserved gene cluster. We suggest that environmental Aeromonas strains may act as a hidden reservoir involved in the circulating of bla PAC-1 . The finding of conserved bla PAC-1 cluster also suggested the existence of multiple transmission pathways of bla PAC-1 in the Asia-Pacific region, involving multiple sources and different species., Competing Interests: The authors declare no conflict of interest.