Typhoid fever is a life-threatening illness caused by the bacteria Salmonella typhi. Anyone can get typhoid fever if they drink water or eat food contaminated with the bacteria. Travelers visiting developing countries are at greatest risk for getting typhoid fever. Symptoms include: constant fever up to 104°; diarrhea; constipation; stomach pain; slow heart rate; exhaustion. Typhoid fever is treated with antibiotics. A person will usually recover in 2-3 days with prompt antibiotic treatment.