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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/579

Title: Studies on the prevalence of giardia cysts and cryptosporidium oocysts in South-African water
Authors: Kfir, R
Hilner, C
Du Preez, M
Bateman, B
Keywords: Giardia cysts
Cryptosporidium oocysts
Raw sewage
Treated effluents
Surface water
Drinking water
Purification processes
Issue Date: 1995
Publisher: Pergamon-Elsevier Science Ltd
Citation: Kfir, R, et al. 1995. Studies on the prevalence of giardia cysts and cryptosporidium oocysts in South-African water. Water Science and Technology, vol. 31, 06 May, pp 435-438
Abstract: The levels of Giardia cysts and Cryptosporidium oocysts in 650 environmental water samples ere investigated. Cysts and oocysts were found in all types of water tested. The presence of Giardia cysts exceeded Cryptosporidium oocysts both in the number per sample and the number of positive samples. Almost 50% of sewage samples studied contained Giardia cysts and 30% contained both Giardia cysts and Cryptosporium oocysts. Treatment of sewage resulted in a reduction in the percentage of samples containing cysts and/or oocysts (30% of treated effluent samples were positive for Giardia and 25% had both cysts and oocysts). Higher numbers of Giardia cysts were found in surface water samples than in either sewage or treated effluents (55% of surface water samples were-positive). However, the number of cysts isolated per surface water sample was lower on average. Most water purification plants showed effective removal of cysts and oocysts. However, 13% of potable water samples contained protozoan parasites, indicating occasional failure of the purification processes and the need for monitoring final treated water.
Description: Copyright: 1995 Pergamon-Elsevier Science Ltd
URI: http://hdl.handle.net/10204/579
ISSN: 0273-1223
Appears in Collections:Pollution and waste
Water resources and human health
General science, engineering & technology

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