Campylobacter infections occur in all age groups however, it is more common in children under five years of age and young adults. The symptoms are often more severe in the elderly and people with pre-existing medical conditions.

Symptoms include diarrhoea (may contain blood), abdominal pain, malaise, fever, nausea and/or vomiting. Symptoms usually occur 2-5 days after exposure and may last 2-5 days, and generally no longer than 10 days. Illness may be prolonged in adults and can mimic appendicitis.