Comprehensive Genome and Plasmidome Analysis of Antimicrobial Resistant Bacteria in Wastewater Treatment Plant Effluent of Tokyo.

To characterize environmental antimicrobial resistance (AMR) in urban areas, extended-spectrum β-lactamase- (ESBL)/carbapenemase-producing bacteria (EPB/CPB, respectively) from urban wastewater treatment plant effluents in Tokyo were isolated on CHROMagar ESBL plate. Complete genome sequence analysis, including plasmids, indicated that 126 CTX-M-positive isolates (31%) were identified among the 404 obtained isolates. The CTX-M-9 group was predominant ( = 65, 52%), followed by the CTX-M-1 group ( = 44, 35%). Comparative genome analysis revealed that CTX-M-27-positive O16:H5-ST131- exhibited a stable genome structure and clonal-global dissemination. Plasmidome network analysis revealed that 304 complete plasmid sequences among 85 isolates were grouped into 14 incompatibility (Inc) network communities (Co1 to Co14). Co10 consisted of primarily IncFIA/IncFIB plasmids harboring in , whereas Co12 consisted primarily of IncFIA(HI1)/Inc FIB(K) plasmids harboring , , and in spp. Co11 was markedly located around Co10 and Co12. Co11 exhibited , , and , and was mainly detected in and spp. from human and animal sources, suggesting a mutual role of Co11 in horizontal gene transfer between and spp. This comprehensive resistome analysis uncovers the mode of relational transfer among bacterial species, highlighting the potential source of AMR burden on public health in urban communities.