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Babesiosis is caused by parasites (Babesia species) that infect red blood cells and are spread by ticks.  In Orange County, we have not had any reported cases acquired locally through ticks.  However, our residents may travel to places where babesiosis is endemic.

Babesiosis is reportable in Orange County within one (1) working day of identification.  To report a case, health care providers/facilities should call OCHCA Epidemiology at 714-834-8180 or fax records to 714-560-4050.  Two to five (2-5) cases of babesiosis were reported in California each year between 2011 and 2016, with none in Orange County.

Last reviewed November 27, 2018