Epidemiology & Assessment

New Orange County Immunization Recommendation for Meningococcal Disease for Men Who Have Sex with Men (MSM)August 9, 2016
The California Department of Public Health is reporting an increase of serogroup C invasive meningococcal disease among men living in Southern California. No direct social connection has been found between the cases, but the majority are men who have sex with men (MSM). One of these cases occurred in an Orange County resident whose illness resulted in death. Because of this local increase in risk, the Orange County Health Care Agency, in conjunction with the Los Angeles County Department of Public Health and City of Long Beach Department of Health and Human Services, is expanding vaccination recommendations for meningococcal disease to include all gay, bisexual, and other men who have sex with men, in addition to all persons with HIV infection.

Zika Virus Infection: Current Recommendations for Orange County Medical ProvidersAugust 19, 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.

Orange County Continues to Have West Nile Virus Disease ReportedAugust 23, 2016
Orange County Mosquito and Vector Control District reports above average West Nile Virus activity in mosquitoes, and human cases continue to be reported.


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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