Giardiasis

Abstract
Physicians in the United States have a limited understanding of parasitic diseases. One reason for this deficiency is that the teaching of parasitic diseases has a low priority in American medical schools.1These diseases are often regarded as exotic entities of distant lands that rarely occur in our country. While it is true that the parasite burden of the American population is much lower than that of populations in developing countries, it is also true that virtually every parasitic disease known to man has been diagnosed in the United States in the past few years.2One of these diseases, giardiasis, has assumed great importance recently in the United States because of increasing numbers of indigenously acquired and imported cases. In the past, the intestinal flagellateGiardia lambliahas been regarded as a parasite of dubious pathogenicity. Experimental infection of man with cysts ofG lambliadoes not give

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