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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.

For questions or comments, please email epi@ochca.com.

Latest News & Health Advisories

CD Health Alert: Orange County Reports Season's First Influenza CaseOctober 9, 2019
The Orange County Health Care Agency (HCA) has confirmed the County's first case of influenza for the 2019-20 season. The best way to prevent the flu is by getting vaccinated. Anyone who has not already received the flu vaccine should get it now before influenza activity increases.
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CD Health Alert: Increase in Mumps Cases in Orange CountySeptember 5, 2019
Since the beginning of June, nine cases of mumps have been identified in Orange County residents. Eight of nine cases were in adults with ages ranging 19-41 years, one case was diagnosed in a 10 year old child.
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Press Release: Potential Public Exposure to International Measles CaseAugust 23, 2019
The Orange County Health Care Agency (HCA) has confirmed that a female teenager traveling internationally from New Zealand to Southern California (Orange and Los Angeles County) from August 11 through August 15, 2019 was infectious with the measles.
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CD Health Alert: Potential Public Exposures to International Measles CaseAugust 23, 2019
The Orange Count Health Care Agency (HCA) has confirmed that a teenage resident of New Zealand who traveled to Southern California (Orange and Los Angeles County) from August 11 through August 15, 2019 was infectious with measles during this period. The case acquired measles infection in New Zealand prior to travel.
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CD Health Alert: Orange County’s First West Nile Virus Human Infection of the Season ReportedAugust 19, 2019
A Tustin woman in her 50s was diagnosed last week with West Nile Virus (WNV) fever. This is the first human WNV infection identified in Orange County this season. Human infections have already been reported this season in the surrounding counties of Los Angeles and San Bernardino.
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