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Giardia

Incubation period: 5 to 25 days

Common clinical features: Diarrhoea, abdominal cramps

Reservoir: It is found in the gastrointestinal tracts of people and animals

Transmission: Person to person. Food borne transmission is rare. Faecal oral in young children. Waterborne. Spread within families is common.

Other relevant features: Cysts resist standard chlorination

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