Chapter

Giardia and Giardiasis

pp 243-261

Waterborne Outbreaks of Giardiasis

Current Status
  • Gunther F. CraunAffiliated withUnited States Environmental Protection Agency

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Abstract

Giardiasis is endemic in many countries of the world including the United States, and in recent years, Giardia lamblia has been identified as the etiologic agent in numerous common-source outbreaks. The waterborne transmission of G. lamblia was suggested as early as 1946 by an epidemiologic investigation of an outbreak of amebiasis attributed to sewage contamination of a water supply in a Tokyo apartment building (Davis and Ritchie, 1948). Entamoeba histolytica and G. lamblia were recovered from 96 (64%) and 116 (77%) occupants, respectively; G. lamblia was isolated from 86% of the occupants who experienced diarrhea with abdominal discomfort and had stools that were negative for E. histolytica.