Giardiasis is a form of gastroenteritis, characterised by diarrhoeal illness that is caused by a microscopic parasite, Giardia lamblia. G. lamblia lives in the intestines of humans and many animals. Giardiasis occurs when the parasites are ingested, most commonly when contaminated water containing the parasites is drunk. Contaminated water may come from lakes or ponds, swimming pools, contaminated drinking water or ice. Giardiasis is a notifiable disease.
Giardiasis
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