Yersiniosis is a bacterial infection primarily caused by Yersinia enterocolitica or Yersinia pseudotuberculosis. It commonly affects young children but can occur at any age, typically through consumption of contaminated food or water.
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*Yersinia enterocolitica* was first identified as a human pathogen in the mid-20th century, distinguishing it from the plague-causing *Yersinia pestis*. Its recognition helped clarify the cause of various gastrointestinal and systemic infections previously undiagnosed, increasing understanding of foodborne illnesses.
Yersiniosis primarily spreads through the fecal-oral route, often by consuming raw or undercooked pork, contaminated unpasteurized milk, or untreated water. Direct contact with infected animals, especially pigs, or their feces can also lead to transmission, as can person-to-person spread in household settings or childcare centers.
Contagious Period: Varies by disease
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This event envelope shares information about Yersiniosis outbreaks in Norway. Yersiniosis was the fourth most commonly reported gastrointestinal infection in the EU/EEA after campylobacteriosis, salmonellosis and Shiga toxin-producing Escherichia coli (STEC) in 2022.
Source: BEACON - View Full Report
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Official guidance from the U.S. Centers for Disease Control and Prevention
View CDC Resources →Global disease surveillance and guidelines from the World Health Organization
View WHO Resources →Disease information on Virus Watcher is reviewed by our Chief Epidemiologist, a former CDC lead analyst for FluSight forecasting. Outbreak data is aggregated from verified sources including BEACON, ProMED, WHO, CDC, and 50+ national health agencies. This information is for educational purposes and should not replace professional medical advice.
Last reviewed: 2026-07-18
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