Epidemic of amoebiasis and giardiasis in a biased population.

Abstract
Of 126 homosexual men in a selected population in New York City [New York, USA], 31.7% were infected with Entamoeba histolytica, 18.3% with Giardia lamblia and 39.7% with 1 or both on a single stool examination. Of 5885 clinic and hospital patients examined in the same laboratory by the same methods, 1.3% were infected with E. histolytica, 2.1% with G. lamblia and 3.3% with 1 or both. An epidemic of intestinal protozoan infection may exist in the homosexual male population in New York City. Difficulty in making a diagnosis, inadequate therapy, failure to alert potential victims and official neglect of the epidemic combine to create a dangerous situation.
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