Giardiasis or beaver fever in humans is a diarrheal infection of the small intestine by a single-celled organism called Giardia lamblia. Giardiasis occurs worldwide with a prevalence of 20–30% in developing countries. In the USA, 20,000 cases are reported to the CDC annually, but the true annual incidence is estimated at 2 million people. Giardia has a wide range including other mammalian hosts besides humans, thus making it very difficult to eradicate. For people with compromised immune systems, such as elderly or AIDS patients, giardiasis can be deadly.Read more on Wikipedia
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