Samples of faeces were taken from 183 healthy pet dogs in a census-based, cross-sectional study in Cheshire; culture methods were used to detect any Campylobacter species and a direct PCR was used to detect Campylobacter upsaliensis. Forty-six of the dogs were positive for C upsaliensis by either culture or direct PCR, giving a prevalence of 25˙1 per cent (95 per cent confidence interval [CI] 19˙0 to 32˙1 per cent). One sample was positive by culture for Campylobacter jejuni (95 per cent CI 0˙0 to 3˙0 per cent) and one for Campylobacter lari. Multivariable logistic regression identified risk factors for the carriage of C upsaliensis by a dog as: living with another dog that also carried C upsaliensis; being small rather than medium-sized; being less than three years old; living in a household that kept fish; being fed commercial dog treats; and being fed human food titbits, particularly in the dog's bowl.
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