Giardiasis is an infection of the small intestine caused by an insidious parasite called Giardia Lamblia. A protozoa that often contaminates water it spreads via contaminated water, soil, animals, contaminated food, direct human contact and household pets. It lives in the intestines and is passed in the faeces. The parasite has a hard outer shell which means that they can survive for long periods of time and contaminated water is generally a likely source for picking up the parasite. Symptoms usually appear 1-2 weeks (but may take longer) after infection and most people are able to eradicate it from the body within 6 weeks if addressed appropriately.