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Giardia: overview and update.

Giardia is a protozoan flagellate that was first observed by Van Leeuwenhoek in 1681 and more fully described by Lamb in 1859. It was initially thought to be a commensal in humans, but it is now clearly recognized as a common cause of diarrhea and malabsorption. Giardia infects millions of people throughout the world in both epidemic and sporadic forms. It is transmitted through ingestion of contaminated water and food, person-to-person contact in child care centers, and male homosexual activity.