Communicable Disease Control

The Communicable Disease Control unit’s medical directors, public health nurses, and epidemiologists investigate individual cases and outbreaks of reported communicable disease (see List of Reportable Diseases) per the State of California Code of Regulations. We monitor disease trends, and often provide current statistics and other information to doctors, hospitals, the public and news media. For more information or CD reporting 24/7 call 714-834-8180, you can also email us at

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Latest News & Health Advisories

CD Health Alert: Guidance For Assessment Of Suspected COVID-19 Variant Cases And Breakthrough Disease In Vaccinated PersonsMarch 3, 2021
COVID-19 variants pose a significant threat to worldwide efforts to end the pandemic; to date, 46 states have reported at least one case of a variant of concern, including cases caused by B1.1.7, B.1.351, and P.1 lineages. The B1.1.7 variant, first identified in the United Kingdom and associated with increased transmission and disease severity, has been identified in Southern California, including Orange County, for several weeks.


CD Health Alert: COVID-19 Update - Quarantine Recommendations For Vaccinated PersonsFebruary 24, 2021
The CDC and the California Department of Public Health have recently updated their COVID-19 quarantine recommendations for persons who have been fully vaccinated. OCHCA will update its health order in accordance with this guidance


CD Health Alert: New Gonorrhea Treatement Guidelines From CDCJanuary 14, 2021
CDC has updated its recommendation for the treatment of uncomplicated gonorrhea in adults. Gonorrhea should now be treated with just one higher dose (500 mg) injection of ceftriaxone, and dual therapy is no longer the recommended approach.


CD Health Alert: Updated COVID-19 Quarantine Guidance for Orange CountyDecember 21, 2020
The Centers for Disease Control and Prevention (CDC) recently published updated recommendations for quarantine of persons following exposure to a COVID-19 case, including options for a shortened quarantine period.

CD Health Alert: First West Nile Virus Human Infection of the Season Reported in Orange CountyAugust 10, 2020
A child under the age of 18 years was diagnosed last week with West Nile Virus (WNV) infection, and was hospitalized but is recovering. This is the first human WNV infection identified in Orange County this season. As of Friday, the California Department of Public Health has reported 10 cases of human West Nile Virus infection statewide.