Typhoid fever is a life-threatening illness caused by the bacterium Salmonella Typhi. An estimated 5,700 cases occur each year in the United States. Most cases (up to 75%) are acquired while traveling internationally. Typhoid fever is still common in the developing world, where it affects about 21.5 million people each year.
- Page last reviewed: March 25, 2013
- Page last updated: June 28, 2018
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