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The definition of giardia is any flagellate of the genus Giardia, parasitic in the intestines of vertebrates.

Giardia lamblia cause a disease called Giardiasis. According to PubMedHealth, the disease is marked by abdominal pain; diarrhea; gas or bloating; headache; loss of appetite; low-grade fever; nausea; swollen or distended abdomen or vomiting.

The disease is caused by a protozoa that is passed through untreated drinking water. Around 80% of cases go away without medical treatment. The others can be treated by anti-infection agents (which kill off the protozoa.)

The most serious effect of the disease is dehydration (from diarrhea.) It's a common problem in places of the world where water isn't properly treated, and also easily picked up by back-packers who fail to treat their water.

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Q: What does giardia cause?
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