Nausea and Vomiting
Abdominal Pain
Fever
watery diarrhea initially, becomes bloody
A smaller percentage will have pain and fever alone (mimicking Appendicitis)
Yersinia enterocolitica
Viral 
Campylobacter jejuni
Bacterial
Clostridium difficile 
Campylobacter
Clostridium difficile
Shigella