Yersinia enterocolitica is a type of bacteria that can cause gastrointestinal infections in humans. It is commonly found in contaminated food, especially undercooked pork, unpasteurized milk, and contaminated water. Symptoms of infection may include diarrhea, abdominal pain, fever, and vomiting. This bacterium is part of the Yersinia genus, which also includes Yersinia pestis, the causative agent of the plague. Infections are more prevalent in colder climates and can affect people of all ages. Proper food handling and cooking practices can help prevent infection.