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Clinical Microbiology Reviews, 01 1997, 67-85, Vol 10, No. 1
MM Marshall, D Naumovitz, Y Ortega and CR Sterling
Protozoan parasites were the most frequently identified etiologic agents in
waterborne disease outbreak from 1991 to 1994. The waterborne parasites
Giardia lamblia, Naegleria fowleri, Acanthamoeba spp., Entamoeba
histolytica, Cryptosporidium parvum, Cyclospora cayetanesis, Isospora
belli, and the microsporidia are reviewed. For each parasite, the review
includes history, life cycle, incidence, symptoms, and therapy. Clinical
detection methods are compared, and emerging technologies are discussed.
Information on the association of these parasites with waterborne outbreaks
is reviewed. Current information on protozoan parasites identified as
etiological agents in waterborne outbreaks is discussed. Water industry
issues related to recent disease outbreaks are examined in the context of
water quality testing regulations for G. lamblia and those proposed for C.
parvum. The review identifies the limitations of the American Society of
Testing and Materials water-testing method for these parasites. An overview
of federal regulations affecting the water industry and laboratories that
test for water quality is also provided. The article highlights the
importance of the clinical laboratory as a frontline defense for the
detection of infectious organisms. The review points to the need for
clinical laboratories, physicians, and public health personnel to
cooperatively plan and assess the challenge of meeting this potential
public health threat.
Copyright © 1997 by the American Society for Microbiology. All rights reserved.
Waterborne protozoan pathogens
Department of Veterinary Science, University of Arizona, Tucson 85721, USA. marshalm@u.arizona.edu
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