Prevalence of antimicrobial resistance in bacteria isolated from Great Cormorants ( Phalacrocorax carbo hanedae ) in Japan

[摘要] Wild birds are recognized as disseminators of antimicrobial-resistant (AMR) bacteria into the environment. Here, we isolated AMR indicator bacteria from 198 Great Cormorant cloacal swabs collected in Shiga ( n= 90), Oita ( n= 52), Gifu ( n= 29), and Gunma ( n= 27) Prefectures, Japan, in 2018 and 2019. In total, 198 Aeromonas spp. and 194 Escherichia spp. were isolated, and their antimicrobial susceptibility was examined. Aeromonas spp. were resistant to colistin (8.6%), nalidixic acid (4%), and other antimicrobials (<2%), with 3.0% positivity for mcr- 3. Escherichia spp. showed resistance to colistin (3.1%), ampicillin (2.6%), tetracycline (2.1%), and other antimicrobials (<2%). This study shows the presence of AMR bacteria in Great Cormorants, indicating that these birds potentially disseminate AMR bacteria.

[学科分类] 兽医学

[关键词] Aeromonas species;antimicrobial-resistant bacteria;Escherichia species;Great Cormorant