Outbreak of Campylobacter in Sweden
Published: 2026-08-27
An increase in Campylobacter infections has been reported across Sweden during summer 2026 according to the Public Health Agency of Sweden (Folkhälsomyndigheten, FoHM (available only in Swedish)). The increase began in late May and has continued through July, following the seasonal pattern observed in previous years. FoHM notes that elevated case numbers are expected to continue during August.
Campylobacter is a genus of bacteria that commonly causes acute gastrointestinal illness, including diarrhoea, abdominal pain, nausea, vomiting, and fever. Symptoms usually develop within 1–3 days after infection. Poultry, particularly improperly handled or insufficiently cooked chicken, is a well-established source of infection. Other possible sources include direct contact with animals, unpasteurised milk, and untreated water.
The summer increase in human infections coincides with an increase in the occurrence of Campylobacter in Swedish chicken flocks. Surveillance data reported by the Swedish Veterinary Agency (information only in Swedish) showed that Campylobacter prevalence in chicken flocks increased during July. FoHM therefore continues to emphasise appropriate food hygiene and safe handling and cooking of poultry. The latest information about this outbreak is available from Folkhälsomyndigheten and on our Campylobacter page within the outbreaks section.
The Swedish Pathogens Portal continues to monitor infectious disease events of public health relevance in Sweden.