Giardiasis is one of the most common pathogenic intestinal protozoal infections worldwide.
Giardia lamblia is the most frequently identified etiologic agent in outbreaks associated with
the ingestion of surface water, often due to ineffective filtration or pretreatment. In addition to
humans, other sources of infection include beavers, perhaps muskrats, and possibly
domestic animals. A low infecting dose (10 to 25 cysts) is reported to be sufficient to produce
human infection. Clinical manifestations range from asymptomatic to a transient or persistent …

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