Salmonella is a type of bacteria that can infect the stomach and intestines and cause mild to severe diarrheal illness. Salmonella can spread from the intestines to blood, bones, or joints, where it can cause severe illness. Serious illness is more common in young children, elderly people, and people with weakened immune systems.
People infected with salmonella usually get better on their own and do not need any treatment other than fluids to prevent dehydration. People with more serious infections may require hospitalization or antibiotics prescribed by a doctor.