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Communicable Disease Control Division

The HCA Public Health Services Communicable Disease Control Division is committed to preventing and controlling the spread of infectious disease in our community. We work collaboratively with local healthcare providers, government agencies, and community partners to identify outbreaks of disease and develop strategies to limit their further spread. Our team monitors disease surveillance data to track trends over time and to define emerging concerns and vulnerable populations. We provide clinical and epidemiological guidance to residents, 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. 

The Communicable Disease Control Division is dedicated to protecting the health and wellbeing of our community. Together we can prevent and control the spread of communicable diseases.

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: Increasing Respiratory Virus Activity in Orange County

For the last several weeks there has been increasing respiratory virus activity in Orange County. Rates of COVID-19, Respiratory Syncytial Virus (RSV), and Influenza disease are...

CAHAN - Limited Availability of Nirsevimab in the United States—Interim CDC Recommendations to Protect Infants from RSV during the 2023–2024 Respiratory Virus Season

The Centers for Disease Control and Prevention (CDC) is issuing this Health Alert Network (HAN) Health Advisory to provide options for clinicians to protect infants from...

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

Last week a woman in her 60s tested positive for West Nile Virus (WNV), becoming the first human WNV infection in Orange County this year, as compared to two cases at this time...

CD HEALTH ALERT: Increase in SARS-CoV-2 Activity in Orange County

Over the last month, the percentage of positive SARS-CoV-2 PCR tests among Orange County residents has been increasing. This is in line with previous seasons where an increase in...

CAHAN - Global Epidemic Comes to California: Silicosis in Countertop Workers

Since 2010, more than 1,000 cases of silicosis in workers who fabricate countertops have been reported worldwide. Workers in this industry can inhale crystalline silica dust as...

CAHAN - Locally Acquired Malaria Cases Identified in the United States

The Centers for Disease Control and Prevention (CDC) is issuing this Health Alert Network (HAN) Health Advisory to share information and notify clinicians, public health...

CAHAN - Guidance on Measles during the Summer Travel Season

As the summer travel season begins, the Centers for Disease Control and Prevention (CDC) is issuing this Health Alert Network (HAN) Health Advisory to remind clinicians and public...

CD HEALTH ALERT: Ongoing Risk of Mpox (formerly Monkeypox) in Orange County

While cases of mpox have been at low levels this year, mpox transmission has continued to occur in California and clusters have been reported in other states . Last week routine...

CAHAN - Important Updates on Outbreak of Fungal Meningitis in U.S. Patients Who Underwent Surgical Procedures under Epidural Anesthesia in Matamoros, Mexico

The Centers for Disease Control and Prevention (CDC) is issuing this Health Alert Network (HAN) Health Update to supplement the CDC HAN Health Advisory issued on May 17, 2023...

CAHAN - Increased Hepatitis A Cases Associated with Homelessness, Drug Use in San Diego County

Twenty-eight acute hepatitis A virus (HAV) infections have been confirmed in San Diego County residents with symptom onset between January 10, 2023, and May 4, 2023. Ages of the...

CD HEALTH ALERT: Universal Screening and Testing Recommendations for Hepatitis B Virus (HBV) and Hepatitis C Virus (HCV)

The CDC recently released new recommendations for Screening and Testing for Hepatitis B Virus infection . These guidelines mirror existing CDC Recommendations for Hepatitis C...

CD HEALTH ALERT: National Shortage of Bicillin L-A

CDC has received reports that some STD programs are currently unable to procure enough penicillin G benzathine (Bicillin L-A®) – the first-line recommended treatment for syphilis –...

CD HEALTH ALERT: Updated Recommendations for the Use of Bivalent mRNA COVID-19 Vaccines

On April 18, 2023, the U. S. Food and Drug Administration (FDA) amended the emergency use authorizations (EUAs) of Moderna and Pfizer-BioNTech COVID-19 bivalent mRNA vaccines. This...

CAHAN - Outbreak of Extensively Drug-resistant Pseudomonas aeruginosa Associated with Artificial Tears

The Centers for Disease Control and Prevention (CDC) is issuing this Health Alert Network (HAN) Health Advisory about infections with an extensively drug-resistant strain of Verona...

CAHAN - Increase in Pediatric Invasive Group A Streptococcal Infections

The Centers for Disease Control and Prevention (CDC) issued a Health Alert Network (HAN) Health Advisory to notify clinicians and public health authorities of a recent increase in...
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News Archive

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.