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Communicable Disease Control Division

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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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...

CAHAN Disease Notification – Influenza A Testing Guidance: Enhanced Surveillance During the Summer Months

In response to the global outbreak of influenza A (H5N1) in birds and recent infections in dairy cattle and humans in the United States, the Centers for Disease Control and...

CAHAN Disease Notification - Meningococcal Disease Cases Linked to Travel to the Kingdom of Saudi Arabia (KSA)

The Centers for Disease Control and Prevention (CDC) is issuing this Health Alert Network (HAN) Health Advisory to alert healthcare providers to cases of meningococcal disease...

CD HEALTH ALERT: Ciprofloxacin-Resistant Neisseria meningitidis

National public health surveillance has recently detected an increase in invasive Neisseria meningitidis (N men) disease caused by isolates that are resistant to ciprofloxacin. In...

CAHAN Disease Notification - Fatality from Lead Poisoning Linked to Use of Hemorrhoid Ointment from Vietnam

The California Department of Public Health is issuing this Health Advisory to notify health care providers, laboratories and public health departments that a woman in Sacramento...

CD HEALTH ALERT: Recommendations for the Use of mRNA COVID-19 Vaccines (2023-2024 Formulations)

On September 11, 2023, the Food and Drug Administration (FDA) updated the emergency use authorizations (EUAs) for Moderna and Pfizer-BioNTech COVID-19 mRNA vaccines (2023-2024...

CD HEALTH ALERT: Identification of a Human Infection due to Highly Pathogenic Avian Influenza A(H5N1)

The CDC released a Health Advisory related to the investigation and response to confirmed human infection with highly pathogenic avian influenza (HPAI) A(H5N1) following exposure...

CAHAN Disease Notification – Increase in Invasive Serogroup Y Meningococcal Disease in the United States

To Orange County providers, Any cases of meningococcal disease, either suspect or confirmed, should be reported to OCHCA immediately at 714-834-8180. The Centers for Disease...

CAHAN Disease Notification - Increase in Global and Domestic Measles Cases and Outbreaks: Ensure Children in the United States and Those Traveling Internationally 6 Months and Older are Current on MMR

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