Giardia lambia and crypto sporidium are water-born parasites that cause intestinal disease. Tiny cysts are produced in the intestinal tract. They pass into the environment via the feces of infected animals or humans.
Chlorine and ultraviolet light will kill most bacteria and mold but will NOT kill these organisms. Water must be treated to kill the cysts. One method is to boil water at least one minute; 10 minutes is better. Certain filters that can filter 1 micrometre particles will remove the cysts.
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