system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
A 4-year-old male presents to the pediatrician with a one week history of fever, several days of bloody diarrhea, and right-sided abdominal pain. The mother explains that several other children at his son's pre-K have been having similar symptoms. She heard the daycare owner had similar symptoms and may have her appendix removed, but the mother claims this may just have been a rumor. Based on the history, the pediatrician sends for an abdominal ultrasound, which shows a normal vermiform appendix. She then sends a stool sample for culturing. The cultures demonstrate a Gram-negative bacteria that is motile at 25 C but not at 37 C, non-lactose fermenter, and non-hydrogen sulfide producer. What is the most likely causative agent?
assistant
Yersinia enterocolitica