An estimated 16-33 million cases of<unk>  result in 500,000 to 600,000 deaths annually. In 2000,<unk>  fever caused an estimated 21.7 million illnesses and 217,000 deaths. Worldwide,<unk>  fever is most prevalent in overcrowded areas with poor hygiene and sanitation.<unk>  fever is still common in the developing world, where it affects about 21.5 million people each year. 1-6% of the individuals who are infected will develop a chronic infection of the gall bladder. The incidence of<unk>  fever varies in different parts of world. Age, race, gender and certain environmental factors affect the distribution of disease among these groups.
Typhoid fever epidemiology and demographics
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Typhus epidemiology and demographics
Scarlet fever epidemiology and demographics
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