Campylobacter is present in the gut of a wide range of animals, especially birds.
Outbreaks have been linked to the consumption of undercooked poultry, unpasteurised milk, water, and other foods that have been contaminated by raw foods like meat and poultry. Pets may also be a source of infection. Campylobacter doesn’t grow well in foods, but it only has to be present in food in low numbers to cause an infection. It is a problem because quite low numbers of the bacteria can cause illness.