How Does Salmonella Typhi Cause Typhoid Fever?
Salmonella typhi bacteria live only in humans. People with typhoid fever carry the bacteria in their bloodstream and intestinal tract. About 3 to 5 percent of people still carry the bacteria, even if symptoms go away with proper treatment. These people are known as typhoid fever carriers. The most famous was Mary Mallon, better known as Typhoid Mary.
