- Protozoan parasite, reservoir primarily human, potentially domestic and sylvatic animals; fecal-oral or waterborne transmission.
- Most commonly identified fecal parasite in North America; common in mountainous areas of Northeast, Rocky Mtn states, Northwest; pockets of high prevalence in urban areas.
- Fecal-oral transmission, including oral-anal transmission during sexual activities.
Giardia lamblia was found in Johns Hopkins HIV Guide.
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