Typhoid fever and paratyphoid fever are serious illnesses. They occur most often in developing countries where sanitation is poor.

Typhoid fever is caused by eating foods or drinking beverages contaminated with the Salmonella bacteria. Contamination can be present in:

  • Food or drinks handled by someone who is sick with typhoid fever
  • Food or drinks handled by someone who has no symptoms but carries the bacteria
  • Water or food contaminated by sewage
  • Unpasteurized dairy products
  • Unrefrigerated poultry products
Digestive System
Small intestines
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