Two species of campylobacter, C. jejuni and C. coli, cause most infections. The bacteria live in the gastrointestinal tract of mammals including livestock and pets such as dogs and cats.
People often get C. jejuni and C. coli from:
raw or undercooked meat, especially poultry
For most infections it’s difficult to trace it back to the exact source. Other causes include contact with pets that have diarrhoea or contact with livestock. Bacteria can also spread through poor hygiene in food preparation, for example if you don’t wash your hands, you can spread bacteria from chicken to salads.
The incubation period is usually 2 to 5 days. But it can be as short as 1 day and up to 11 days.