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WHO WE ARE: The HCA Public Health Services Communicable Disease Control Division works to prevent and control the spread of infectious diseases in our community. We work with local healthcare providers, government agencies, and community partners to identify outbreaks of disease and develop strategies to limit their further spread. California's legal code also mandates the reporting of certain diseases. For more information, please see the links below.   

WHAT WE DO: Our team monitors disease surveillance data and provides clinical and epidemiological guidance to residents, healthcare providers, and the broader community. In addition, we may also assist with diagnosis, treatment, and preventative services such as vaccination and prophylactic treatment when needed.  

Together we can prevent and control the spread of communicable diseases. 

CONTACT US: For more information or CD reporting 24/7 call 714-834-8180, you can also email us at epi@ochca.com.

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Latest News and Health Advisories

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CAHAN Disease Notification – Suspect Measles? Isolate, Report to Local Public Health and Test

CDPH/Health Advisory- March 25, 2025 - Multiple measles cases have been confirmed in California in recent weeks. All cases have been linked to international travel, reflecting a...

OCHCA: Nitrous Oxide Information and Survey

On March 14, 2025, the Food and Drug Administration (FDA) issued a Consumer Advisory advising consumers not to inhale nitrous oxide products from any size canisters, tanks, or...

CDC HAN 523: Ongoing Risk of Dengue Virus Infections and Updated Testing Recommendations in the United States

The Centers for Disease Control and Prevention (CDC) is issuing this Health Alert Network (HAN) Health Update to provide additional information to healthcare providers, public...

Epi-X Notification - Adverse Events Following Receipt of Injectable Ceftriaxone

The Centers for Disease Control and Prevention (CDC), in collaboration with state and local health departments, is investigating reports of serious adverse events, including deaths...

CAHAN Disease Notification - Marburg virus disease in Tanzania and Ebola disease outbreak in Uganda

The California Department of Public Health (CDPH) is closely monitoring an Ebola disease outbreak in Uganda caused by Sudan virus and a Marburg Virus Disease (MVD) outbreak in...

CD HEALTH ALERT: Risk of Highly Pathogenic Avian Influenza (HPAI) Influenza A (H5N1) in Cats and Raw Pet Food

Two Orange County cats have been diagnosed with presumptive HPAI influenza A (H5N1). These animals reportedly consumed raw pet food sold at a farmers’ market. No transmission to...

CD HEALTH ALERT: HIV, Syphilis and Hepatitis C Among People Experiencing Homelessness in Orange County

People experiencing homelessness (PEH) are at increased risk for HIV and hepatitis C. The vast majority of recent HIV cases among PEH in Orange County have been co-infected with...

CAHAN Disease Notification – Accelerated Subtyping of Influenza A in Hospitalized Patients

The Centers for Disease Control and Prevention (CDC) is issuing this Health Alert Network (HAN) Health Advisory to clinicians and laboratories due to sporadic human infections with...

CD HEALTH ALERT: Measles in a Traveler in Orange County

A case of measles has been confirmed in a child who returned at the end of November after international travel. Potential exposures may have occurred in the following situations...

CD HEALTH ALERT: Confirmed Case of Trichophyton mentagrophytes Genotype VII (TMVII) in Orange County

The OC Health Care Agency (HCA) recently identified the first case of Trichophyton mentagrophytes (TMVII) in Orange County. TMVII is a recently emerged cause of dermatophyte (e.g...

CD HEALTH ALERT: Increase in Legionnaire’s Disease in Northwestern Westminster

The OC Health Care Agency (HCA) was notified of seven confirmed cases of Legionnaire’s Disease (LD) among residents living in a community in a northwestern corner of Westminster...

CD HEALTH ALERT: Preparation for the Respiratory Virus Season 2024-2025

This alert aims to raise awareness of current guidance around the prevention and treatment of respiratory pathogens as we begin the 2024-2025 respiratory virus season. In addition...

CAHAN Disease Notification – First Marburg Virus Disease Outbreak in the Republic of Rwanda

The Centers for Disease Control and Prevention (CDC) is issuing this Health Alert Network (HAN) Health Advisory to inform clinicians and health departments about the Republic of...

CD HEALTH ALERT: Mpox in Orange County Updated Guidance on Exposures

Mpox infections, from Clade II Monkeypox virus, continue to be endemic in the United States. Orange County has had an increase in mpox cases over the summer. Orange County Pride...

CD HEALTH ALERT: Dengue Virus Infection in Travelers

In 2024, Orange County has already identified 25 cases of dengue virus infection. This exceeds the number of county residents identified with dengue virus infection in any year...

CD HEALTH ALERT: Recommendations for the Use of COVID-19 Vaccines for the 2024-2025 Season

On August 23, 2024, the Food and Drug Administration (FDA) approved and authorized the 2024-2025 Moderna and Pfizer-BioNTech COVID-19 vaccines. The FDA reported that doses would...

CD HEALTH ALERT: First Human West Nile Virus Case of the Season Reported in Orange County

A resident of Huntington Beach has tested positive for West Nile Virus (WNV) infection, becoming the first human WNV case in Orange County this year. In 2023, Orange County had...

CAHAN Disease Notification – Increased Oropouche Virus Activity and Associated Risk to Travelers

The Centers for Disease Control and Prevention (CDC) is issuing this Health Alert Network (HAN) Health Advisory to notify clinicians and public health authorities of an increase in...

CAHAN Disease Notification – Increase in Human Parvovirus B19 Activity in the United States

The Centers for Disease Control and Prevention (CDC) is issuing this Health Alert Network (HAN) Health Advisory to notify healthcare providers, public health authorities, and the...

CD HEALTH ALERT: Measles in a Traveler in Orange County

A case of measles has been confirmed in an adult who traveled to Orange County. The person began having symptoms prior to arrival. Potential exposures may have occurred at several...

CDC Health Advisory - Disruptions in Availability of Becton Dickinson (BD) BACTECTM Blood Culture Bottles

The Centers for Disease Control and Prevention (CDC) is issuing this Health Alert Network (HAN) Health Advisory to inform healthcare providers, laboratory professionals, healthcare...

CAHAN Disease Notification – Increased Risk of Dengue Virus Infections in the United States

The Centers for Disease Control and Prevention (CDC) is issuing this Health Alert Network (HAN) Health Advisory to notify healthcare providers, public health authorities and the...

CAHAN Disease Notification – Reports of Rare, Severe Dermatophyte Infections Associated with Sexual Contact in the United States

The California Department of Public Health (CDPH) would like to inform health care providers that the first known United States (U.S.) case of sexually transmitted Trichophyton...

CAHAN Disease Notification – Severe Illness Potentially Associated with Consuming Diamond Shruumz Brand Chocolate Bars, Cones, and Gummies

The Centers for Disease Control and Prevention (CDC), Food and Drug Administration (FDA), America’s Poison Centers, and state and local partners are investigating reports of severe...
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California Code of Regulations, Title 17, Section 2500, mandates that certain communicable and non-communicable diseases/conditions be reported to the local health department using specified methods and time frames. The List of Mandated Reportable Diseases in Orange County, which summarizes disease reporting requirements for providers, may be downloaded from this website and freely copied. In addition, clinical laboratories serving California residents are mandated to report specific clinical positive results according to the List of Laboratory Reportable Diseases.