Epidemiology & Assessment

Third Mumps Case Identified in College Student from Orange CountyApril 14, 2016
An Orange County college student was diagnosed with mumps last week, the third Orange County student diagnosed with mumps in the last two months. All three attend college outside of Orange County, but all three were in the County when they became ill and were diagnosed. Outbreaks of mumps have occurred at college campuses around the country since late 2015. As students travel to and from school during spring break, community exposure to mumps cases may occur.

Zika Virus Infection: Current Recommendations for Orange County Medical ProvidersMarch 10, 2016
Health care providers who have clinical questions, wish to arrange testing for a patient, or have a suspect case to report, should call the Epidemiology and Assessment Program at 714-834-8180.

Zika Virus Continues to Spread in Latin AmericaApril 12, 2016
Zika virus outbreaks have been occurring in many parts of Latin America since 2015. The virus causes mild illness in most persons, but infection during pregnancy can cause congenital disease, and pregnant women should avoid travel to areas where the virus is spreading. There is no evidence of Zika transmission in Orange County. But travelers, particularly pregnant women, should be aware of the risks and take measures to protect against mosquito bites.


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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