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Cryptosporidium and Giardia are intestinal parasites which cause a self limiting gastro-enteritis, in healthy people but severe and often fatal disease in immuno-compromised individuals. Both organisms are characterised by the ability to survive in an aquatic environment with Cryptosporidium having a high tolerance to most of the drinking water disinfectants. The absence of bacteria associated with feacal pollution does not necessarily indicate the absence of Cryptosporidium or Giardia. Being adoi:10.4314/wsa.v30i5.5163 fatcat:dw2zw4b4s5gxjoqaebq32y73ju