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Giardia is a parasite that can cause diarrhea.  Illness caused by Giardia (Giardia intestinalis, Giardia lamblia, or Giardia duodenalis) is called giardiasis.  Giardia can be found throughout the world, including the United States, and affects people and animals.

Giardiasis is reportable in Orange County within seven (7) calendar days of identification.  To report a case, health care providers/facilities should call OCHCA Epidemiology at 714-834-8180, fax reports to 714-560-4050, or mail to P.O. Box 6128, Santa Ana, CA  92706-0128.   An average of 141 cases of giardiasis were reported each year in Orange County between 2013 and 2017.

For more information, see the Centers for Disease Control (CDC) website

Last reviewed December 4, 2018