Salmonellosis is an infection with a bacteria called Salmonella, Salmonella live in the intestinal tracts of animals, including birds. Salmonella are usually transmitted to humans by eating foods contaminated with animal feces. Signs and symptoms of salmonella infection generally last a few days to a week. Possible signs and symptoms of salmonella infection include: Diarrhea. Stomach (abdominal) cramps. Fever. Nausea. Vomiting. Chills. Headache. Blood in the stool.