the environment through the feces of warm-blooded animals, including humans. Contaminated water or ice usually is the source. Municipal water filtration controls this parasite; chlorine doesn't destroy it. Proper hand washing and food handling are extra controls you can take at home. People with compromised immune systems and children are among those at higher risk. See "Drinking Water: For Special Health Needs " in chapter 8.
Giardiasis, most often caused by drinking untreated water, also may be transmitted by uncooked food contaminated with Giardia or by passing the parasite from hand to hand on surfaces. In recent years, giardiasis has become one of the most common causes
of waterborne disease among humans in the United States. Another source of gastrointestinal symptoms, it more likely strikes campers and hikers, travelers, diaper-age children who go to day-care centers, and others who drink untreated water from contaminated sources. Symptoms typically appear one to two weeks after infection and may last several weeks. Boiling
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