Epidemiological investigation of Riemerella anatipestifer in large-scale chicken farms in 29 provinces of China from 2021 to 2024.

ABSTRACT: Riemerella anatipestifer causes septicemia in waterfowl, especially in ducks worldwide, while it is becoming a threat to chicken farming in China. In this study, a total of 27,136 samples from septicemic chickens and dead embryos were collected in 29 provinces from 2021 to 2024 to characterize the transmission dynamics of R. anatipestifer and guide evidence-based control strategies. A total of 752 R. anatipestifer strains were isolated and identified by PCR, showing rapid geographical expansion (from 10 to 19 provinces) and rapidly increasing isolation rates (from 1.03 % to 4.56 %), with peaking in winter/spring. Infection shifted toward younger chickens, infection rates in 3-6-week-old white-feathered broilers increased dramatically from 0.99 % to 13.24 % (mainly leg lesions), while 50-10

SUBMITTER: Zhang C 

PROVIDER: S-EPMC12269571 | biostudies-literature | 2025 Jun

REPOSITORIES: biostudies-literature