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Although most disease causing microscopic animals, or protozoa, are not naturally found in water, they can survive in water for a period of time. Examples of such animals include Giardia and Cryptosporidium. Their presence is also attributable to human and animal wastes, but unlike most bacteria and viruses, they can be particularly difficult to detect and treat in drinking water. This is because they are resistant to chlorine and can easily pass through inefficient filtration devices.

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