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Background   Salmonella enterica  in cattle has long been problematic and suspected to be transmitted by wildlife in Tokachi, Hokkaido, a major cattle farming area in Japan. Understanding the role of wildlife in  S. enterica  transmission would be helpful for developing control strategies of bovine salmonellosis.    Objectives  We aimed to elucidate the possibility of  S. enterica  transmission between sympatric wildlife, including raccoons and crows and cattle, in Tokachi from 2008 to 2018 by analysing  S. enterica  detection records, and the genetic relatedness of serotypes shared between wildlife and cattle.    Methods   S. enterica  detection records were based on the results of a field survey and existing cattle records at relevant organisations, including clinical reports, a monitoring survey and quarantine for introduced calves at growing farms and public calving farms.  S. enterica  was identified by polymerase chain reaction assay and serotyped by agglutination assay. The detection records were organised chronologically to investigate whether common serotypes in wildlife and cattle were detected in the same year. The isolates corresponding to detection records were assessed for their genetic patterns by pulsed‐field gel electrophoresis.    Results  The prevalence of  S. enterica  in raccoons and crows was 10.7% (17/159) and 5.7% (55/967), respectively. The following serotypes were detected from both wildlife and cattle: Braenderup, Dublin, Infantis, Mbandaka, Montevideo, 4,[5],12:i:‐ and Typhimurium. Genetically similar isolates for  S . Braenderup,  S . Dublin,  S . Montevideo and  S . 4,[5],12:i:‐ were detected from both species in the same year.    Conclusions  Our long‐term retrospective observations supported that  S. enterica  was shared between wildlife and cattle. Wildlife invasions should be controlled at farms to prevent inter‐species transmission of  S. enterica  from livestock farms.

veterinary medicine and science

Is  Salmonella enterica  shared between wildlife and cattle in cattle farming areas? An 11‐year retrospective study in Tokachi district, Hokkaido, Japan