Epidemiology & Assessment

Outbreak of Meningococcal Disease among Adult Males in Southern CaliforniaJuly 14, 2016
The California Department of Public Health is reporting an increase of 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. All HIV-infected persons as well as MSM persons who are not HIV-infected but may be at increased risk of meningococcal disease should receive meningococcal conjugate vaccination.

Zika Virus Infection: Current Recommendations for Orange County Medical ProvidersJune 6, 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 Reports First West Nile Virus Positive Mosquito Samples and Dead Birds This SeasonMay 23, 2016
These are the first indications of WNV in Orange County this year. See the Orange County Mosquito and Vector Control District (OCMVCD) website, www.ocvcd.org, for more information about mosquito and bird testing. No human cases have been reported yet this season in California. The first human cases in Orange County are typically reported in June or July. Now is a great time to remind patients, families, friends and neighbors to remove sources of standing water from around their homes and make sure their windows and screens are in good repair to decrease their risk of WNV infection.


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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