Epidemiology & Assessment

Orange County reports first human West Nile Virus case of 2015August 7, 2015
A 51 year-old resident of the city of Orange tested positive this week for West Nile Virus (WNV) infection, becoming the County’s first human WNV infection in 2015. The man experienced symptoms during the third week of July and has completely recovered.


Raw Goat Milk Associated with Campylobacter Cases in Orange CountyThree cases of Campylobacter infection have been identified in the last three weeks in Orange County children who drank raw goat milk distributed by Claravale Farm prior to illness. The Orange County Health Care Agency (OCHCA) is working with the California Department of Public Health to further investigate this situation. OCHCA advises against consuming Claravale Farm raw goat milk at this time.

Orange County reports its first West Nile Virus Positive Mosquito SampleMay 22, 2015
This sample was collected during the week of May 15 in Tustin and tested by Orange County Mosquito and Vector Control District (OCMVCD). It is the first indication of West Nile virus (WNV) in the County this season.



Certain communicable diseases are required to be reported to the local health department (see List of Reportable Diseases) as per the State of California Code of Regulations. Epidemiology and Assessment (E&A) unit's medical directors, public health nurses, and epidemiologists investigate individual cases and outbreaks of reported communicable diseases. We monitor disease trends, and often provide current statistics and other information to doctors, hospitals, the public and news media. We may also provide education or preventive treatment in some circumstances. Although other units handle reports of HIV/AIDS, tuberculosis (TB) or sexually transmitted diseases (STDs), we do monitor their trends in Orange County. For more information or to report a Public Health emergency 24/7 call 714-834-8180.

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