The epidemiology of Giardiasis.
Giardiasis is now known to occur not only endemically, but also as an epidemic disease spread primarily via drinking water. Giardia from different animals, although morphologically indistinguishable, vary in host specificity. This raises the possibility that lower animals may harbour representatives of this genus which are transmissible to humans. In this article, Ernest Meyer discusses our present understanding of the epidemiology of Giardia, related to problems of speciation in this genus.
Meyer
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Department of Microbiology and Immunology, The Oregon Health Sciences University, 3181 S.W. Sam Jackson Park Road, Portland, Oregon 97201, USA.