Campylobacter is a group of bacteria found widely in warm-blooded animals. WHO describes it as the most common bacterial cause of human gastroenteritis worldwide and one of four key global causes of diarrhoeal disease.
Why does WHO highlight young children?
Foodborne disease can be especially severe in young children. WHO reports that Campylobacter infection is particularly frequent among children under two in developing countries. Most infections are mild, but deaths can occur among very young children, older people and people whose immune systems are weakened.
This identifies groups that may face greater risk; it does not predict how severe an individual child’s illness will be. Hydration, general condition, age and other health factors require individual assessment.
What symptoms can Campylobacter cause?
Symptoms usually start 2–5 days after infection, although WHO gives a possible range of 1–10 days. Common symptoms include diarrhoea, which may be bloody, abdominal pain, fever, headache, nausea and vomiting. Symptoms typically last 3–6 days.
These symptoms overlap with many other infections and non-infectious conditions. The appearance or timing of diarrhoea cannot identify Campylobacter without appropriate testing and clinical context.
Can complications occur?
WHO says death is rare and is usually reported among very young children, older people or people with another serious disease. Reported complications include bacteria entering the blood, inflammation affecting the liver or pancreas, and miscarriage.
Post-infection complications can include reactive arthritis and, in a small number of cases, Guillain-Barre syndrome, a neurological disorder that can cause severe weakness and breathing problems. Listing these complications does not mean they are expected in most cases.
How does infection spread?
The main route is believed to be foodborne. WHO identifies undercooked meat and meat products, raw or contaminated milk, contaminated water and ice among recognized sources. Undercooked contaminated poultry is thought to be a major contributor.
Campylobacteriosis is a zoonosis, meaning an infection transmitted to humans from animals or animal products. Meat may be contaminated by faeces during slaughter even when the animal showed no illness. Recreational contact with contaminated water can also account for some infections.
What does WHO say about treatment?
WHO says treatment is generally not required apart from replacement of fluids and electrolytes. Antimicrobial treatment is recommended for invasive disease or to eliminate a carrier state in particular circumstances.
This source statement is not a recommendation to manage a child’s diarrhoea without assessment. A clinician decides whether testing, rehydration support or antimicrobial treatment is appropriate. Antibiotics should not be started from a general webpage.
How can food preparation reduce risk?
Campylobacter is killed by heat. WHO says heating methods such as thorough cooking or pasteurization are effective ways to eliminate it from contaminated food. Measures in the domestic kitchen resemble those used against other foodborne bacterial diseases.
WHO’s advice for the public and travellers includes:
- serve food properly cooked and still hot;
- avoid raw milk and products made from raw milk;
- use pasteurized or boiled milk;
- avoid ice unless it is made from safe water; and
- boil or appropriately disinfect drinking water when its safety is questionable.
Prevention also depends on controls throughout farming, slaughter, processing, manufacturing and commercial food preparation. Good household practice reduces risk but cannot guarantee that every food is free of bacteria.
Why does prevention extend beyond the home kitchen?
WHO describes control measures at every stage of the food chain, from agricultural production to processing, manufacturing and preparation. Hygiene during slaughter can reduce faecal contamination of meat, although it cannot guarantee that Campylobacter is absent. WHO also notes that reducing the organism in poultry flocks has been associated with fewer human cases in countries that introduced specific control strategies.
Public-health measures include food-safety standards, disease surveillance, education for consumers and training for food handlers. Laboratory capacity and coordinated outbreak response help authorities detect patterns that may not be visible from an individual case.
How should the source’s rehydration statement be read?
Replacing fluids and electrolytes is the general treatment principle WHO highlights. The amount and route depend on the person’s losses and condition. A young child who cannot drink adequately, vomits repeatedly or shows signs of dehydration may need prompt clinical assessment rather than continued home observation.
When should medical advice be sought?
Seek professional advice for bloody diarrhoea, persistent vomiting, worsening abdominal pain, marked weakness, reduced drinking, reduced urination or concern about dehydration. Very young children and children with serious underlying conditions may need earlier assessment. Severe lethargy, breathing difficulty, collapse or other signs of critical illness require emergency care.
Why is poultry frequently discussed?
Campylobacter is widespread among food animals, including poultry, cattle, pigs and sheep, and it can also be found in pets and shellfish. WHO says undercooked contaminated poultry is believed to be a major contributor to human infection, although the relative contribution of every possible source is difficult to measure.
The organism may contaminate a carcass from faeces during slaughter while causing little or no disease in the animal. This explains why appearance and smell cannot establish that raw meat is free of Campylobacter and why hygienic handling and thorough cooking both matter.
What do the usual time ranges tell readers?
WHO’s 1–10 day possible onset range and usual 3–6 day symptom duration describe patterns seen across cases. They cannot prove which meal, animal contact or water exposure caused an individual illness. Many cases are sporadic and have no easily recognized common source.
A duration within the usual range does not automatically make illness safe to manage without advice. The child’s drinking, urination, alertness, age and underlying health are relevant when deciding whether assessment is needed.
References
- World Health Organization. Campylobacter, 1 May 2020. Source reviewed 4 October 2026.