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Consumption and handling of chicken meat are well-known risk factors for acquiring campylobacteriosis. This study aimed to describe the  Campylobacter jejuni  population in Finnish chickens and to investigate the distribution of  C. jejuni  genotypes on Finnish chicken farms over a period of several years. We included 89.8% of the total  C. jejuni  population recovered in Finnish poultry during 2004, 2006, 2007, 2008, and 2012 and used multilocus sequence typing (MLST) and pulsed-field gel electrophoresis (PFGE) to characterize the 380 isolates. The typing data was combined with isolate information on collection-time and farm of origin. The  C. jejuni  prevalence in chicken slaughter batches was low (mean 3.0%, CI 95%  [1.8%, 4.2%]), and approximately a quarter of Finnish chicken farms delivered at least one positive chicken batch yearly. In general, the  C. jejuni  population was diverse as represented by a total of 63 sequence types (ST), but certain predominant MLST lineages were identified. ST-45 clonal complex (CC) accounted for 53% of the isolates while ST-21 CC and ST-677 CC covered 11% and 9% of the isolates, respectively. Less than half of the  Campylobacter  positive farms (40.3%) delivered  C. jejuni -contaminated batches in multiple years, but the genotypes (ST and PFGE types) generally varied from year to year. Therefore, no evidence for a persistent  C. jejuni  source for the colonization of Finnish chickens emerged. Finnish chicken farms are infrequently contaminated with  C. jejuni  compared to other European Union (EU) countries, making Finland a valuable model for further epidemiological studies of the  C. jejuni  in poultry flocks.

Predominant Campylobacter jejuni Sequence Types Persist in Finnish Chicken Production