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Poultry and poultry products are commonly considered as the major vehicle of  Campylobacter  infection in humans worldwide. To reduce the number of human cases, the epidemiology of  Campylobacter  in poultry must be better understood. Therefore, the objective of the present study was to determine the distribution and genetic relatedness of  Campylobacter  in the Thai chicken production industry. During June to October 2012, entire broiler production processes (i.e., breeder flock, hatchery, broiler farm and slaughterhouse) of five broiler production chains were investigated chronologically. Representative isolates of  C .  jejuni  from each production stage were characterized by  flaA  SVR sequencing and multilocus sequence typing (MLST). Amongst 311 selected isolates, 29  flaA  SVR alleles and 17 sequence types (STs) were identified. The common clonal complexes (CCs) found in this study were CC-45, CC-353, CC-354 and CC-574.  C .  jejuni  isolated from breeders were distantly related to those isolated from broilers and chicken carcasses, while  C .  jejuni  isolates from the slaughterhouse environment and meat products were similar to those isolated from broiler flocks. Genotypic identification of  C .  jejuni  in slaughterhouses indicated that broilers were the main source of  Campylobacter  contamination of chicken meat during processing. To effectively reduce  Campylobacter  in poultry meat products, control and prevention strategies should be aimed at both farm and slaughterhouse levels.

Distribution and Genetic Profiles of Campylobacter in Commercial Broiler Production from Breeder to Slaughter in Thailand