AKA Beaver Fever


By Cheng-Hung Tai, M.D. and Rich Strongwater, M.D.

Giardiasis is a disease caused by the parasite Giardia (Giardia duodenalis, lamblia, and intestinalis). Common symptoms include greasy loose stools or diarrhea, abdominal cramping, weight loss, nausea/vomiting, and fever. Symptoms typically start 1 to 3 weeks after infection and may last up to 2 to 6 weeks in immune-competent patients. It is caused by the spread of Giardia cysts found within contaminated food or water, where the host (humans) would ingest.

It is the most common human parasitic disease worldwide, and most commonly seen in the developing world, with prevalence reported as high as 40%....

The full Giardiasis InBrief includes:

Diagnostic Evaluation


Treatment Options

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Sources and further reading:

Schlagenhauf P, Weld L, Goorhuis A, et al. Travel-associated infection presenting in Europe (2008-12): an analysis of EuroTravNet longitudinal, surveillance data, and evaluation of the effect of the pre-travel consultation. Lancet Infect Dis. 2015;15(1):55-64.

Shane AL, Mody RK, Crump JA, et al. 2017 Infectious Diseases Society of America Clinical Practice Guidelines for the Diagnosis and Management of Infectious Diarrhea. Clin Infect Dis. 2017;65(12):e45-e80.

Ross AG, Olds GR, Cripps AW, Farrar JJ, Mcmanus DP. Enteropathogens and chronic illness in returning travelers. N Engl J Med. 2013;368(19):1817-25.

Desai, A. Giardiasis. JAMA. 2021;325(13):1356. doi:10.1001/jama.2020.10289

Hooshyar H, Rostamkhani P, Arbabi M, Delavari M. Giardia lamblia infection: review of current diagnostic strategies. Gastroenterol Hepatol Bed Bench. 2019; 12(1): 3–12. PMCID: PMC6441489

PMID: 30949313


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