National Organization for Rare Disorders, Inc.

It is possible that the main title of the report Giardiasis is not the name you expected. Please check the synonyms listing to find the alternate name(s) and disorder subdivision(s) covered by this report.


  • Beaver Fever
  • Lambliasis

Disorder Subdivisions

  • None

General Discussion

Giardiasis is an infectious disease that is caused by single-celled parasites (microorganisms) known as protozoa that belong to the Giardia lamblia family. Some individuals with giardiasis will not have any symptoms (asymptomatic). Others will have a variety of symptoms affecting the gastrointestinal tract including acute or chronic diarrhea, abdominal cramps, bloating, and a general feeling of ill health (malaise). The parasites live in the small intestines of humans and other mammals. The Giardia lamblia parasite has caused epidemics in certain parts of the United States where animals such as beavers contaminated drinking water by excreting the parasite through their feces. The Giardia lamblia cysts can survive in cold water for several months.


Centers for Disease Control and Prevention
1600 Clifton Road NE
Atlanta, GA 30333
Tel: (404)639-3534
Tel: (800)311-3435

NIH/National Institute of Allergy and Infectious Diseases
6610 Rockledge Drive
MSC 6612
Bethesda, MD 20892-6612
Tel: (301)496-5717
Fax: (301)402-3573
TDD: (800)877-8339

World Health Organization (WHO) Regional Office for the Americas (AMRO)
Pan American Health Organization (PAHO)
525 23rd Street NW
Washington, DC 20037
Tel: (202)974-3000
Fax: (202)974-3663

Genetic and Rare Diseases (GARD) Information Center
PO Box 8126
Gaithersburg, MD 20898-8126
Tel: (301)251-4925
Fax: (301)251-4911
Tel: (888)205-2311
TDD: (888)205-3223

For a Complete Report

For a Complete Report

This is an abstract of a report from the National Organization for Rare Disorders, Inc. ® (NORD). A copy of the complete report can be obtained for a small fee by visiting the NORD website. The complete report contains additional information including symptoms, causes, affected population, related disorders, standard and investigational treatments (if available), and references from medical literature. For a full-text version of this topic, see

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