Serologic prevalence data indicate that<unk>  is one of the most common human infections throughout the world.  Infection is more common in warm climates and at lower altitudes than in cold climates and mountainous regions.  High prevalence of infection in France has been related to a preference for eating raw or undercooked meat, while high prevalence in Central America has been related to the frequency of stray cats in a climate favoring survival ofoocysts.  The overall seroprevalence in the United States as determined with specimens collected by the third National Health and Nutritional Assessment Survey (NHANES III) between 1988 and 1994 was found to be 22.5%, with seroprevalence among women of childbearing age (15 to 44 years) of 15%.
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