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Campylobacter  is one of the most important foodborne pathogens worldwide, and poultry is regarded as the main reservoir of  Campylobacter . The contamination of  Campylobacter  in broiler chickens at the farm level is closely related to the transmission of  Campylobacter  in the poultry production chain. This study identified 464  Campylobacter  isolates from 1,534 samples from broiler rearing period and slaughtering process including 233  Campylobacter jejuni  isolates and 231  Campylobacter coli  isolates. We have observed a dynamic distribution of  Campylobacter  during broiler chicken production, that 66.3% of Campylobacter isolates were  C. jejuni  during broiler rearing period, while  C. coli  occupied 60.4% of Campylobacter isolates during the broiler slaughtering process. A tag-label method allowed us to track the dynamic of  Campylobacter  in each broiler chicken from 31-day age at rearing to the partition step in the slaughterhouse. At the 31-day during rearing, 150 broiler chicken were labeled, and was tracked for Campylobacter positive from rearing period to slaughtering process. Among the labeled broiler, 11 of the tracking broiler samples were able to detect  Campylobacter  from rearing period to slaughtering. All  Campylobacter  isolates from the 11 tracking samples were sequenced and analyzed.  C. jejuni  isolates were divided into four STs and  C. coli  isolates were divided into six STs. Isolates with identical core genome were observed from the same tag-labeled samples at different stages indicating a vertical transmission of  Campylobacter  in the early broiler meat production. Meanwhile, the core genome analysis elucidated the cross-contamination of  Campylobacter  during the rearing period and the slaughtering process. The virulotyping analysis revealed that all  C. jejuni  isolates shared the same virulotypes, while  C. coli  isolates were divided into three different virulotypes. The antimicrobial resistance gene analysis demonstrated that all  Campylobacter  isolates contained at least two antibiotic resistance genes (ARGs), and the ARG profiles were well-corresponding to each ST type. Our study observed a high prevalence of  Campylobacter  during the early chicken meat production, and further studies will be needed to investigate the diversity and transmission of  Campylobacter  in the poultry production chain.

Characterization and Prevalence of Campylobacter spp. From Broiler Chicken Rearing Period to the Slaughtering Process in Eastern China