Giardia duodenalis

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Human and animal [1]

Fecal-oral transmission or ingestion of contaminated water. Contaminated food is a less common etiology. Person-to-person spread is common.[1]

Averages 1-2 weeks, with a mean of 9 days[2]

Giardiasis is not associated with mortality except in rare cases of extreme dehydration, primarily in infants or malnourished children [2]

It is reported that the national giardiasis cases were 7.5, 7.6 and 7.4 per 100,000 population in 2006, 2007, and 2008[3]

Duration of Infectiousness and disease



Asymptomatic Rates

Excretion Rates (see Exposure)


A microscopic parasite that causes the diarrheal illness known as giardiasis[3]


  1. 1.0 1.1 Wiki
  2. 2.0 2.1 Medscape
  3. 3.0 3.1 CDC MMWR Cite error: Invalid <ref> tag; name "CDC" defined multiple times with different content