Epidemiology & Assessment

The Epidemiology and Assessment 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

Hep A in Homeless PopulationJune 22, 2017
As of June 20, 2017, San Diego County has had 181 cases of hepatitis A, including 4 deaths, reported since early 2017, primarily in homeless and/or illicit drug user populations. Santa Cruz County has also reported 12 cases of hepatitis A mainly in their homeless and/or illicit drug user population in the last two months.

CD Connection Newsletter - JuneJune 16, 2017
Botulism is caused by Clostridium botulinum, a Gram-positive, anaerobic, spore-forming bacterium which produces botulinum toxin, the most potent neurotoxin known. Clostridium species are ubiquitous in the
environment, found in soil, dust, and water sediments. Cases of foodborne, wound, and infant botulism have been identified in Orange County residents in 2017.

Hepatitis A Cases in Orange County Residents Without a History of TravelJune 13, 2017
Three cases of hepatitis A virus (HAV) infection have been diagnosed in Orange County residents in the last month. The cases are adult males aged 32-57, none with a history of travel or other apparent hepatitis A exposure. Illness onset dates ranged from May 2 to May 26. A common source for these infections has not been identified; Orange County Public Health is investigating the situation.

Recall of Tuna Potentially Contaminated with Hepatitis A Distributed Nationally, Including Orange CountyJune 2, 2017
A recall has been issued of frozen tuna potentially contaminated with hepatitis A which was sourced from Sustainable Seafood Company, Vietnam, and Santa Cruz Seafood Inc., Philippines. This voluntary recall was issued as part of an ongoing Food and Drug Administration (FDA) and Centers for Disease Control and Prevention (CDC) investigation. The complete recall advisory can be found at: https://www.fda.gov/Food/RecallsOutbreaksEmergencies/Outbreaks/ucm561199.htm

Two New Mumps Cases Identified in Orange CountyMay 18, 2017
Two new cases of mumps have been identified in Orange County residents. Both cases are young adults in their twenties with no history of travel or contact to other cases. They had symptom onset dates of April 17 and May 6. One case was confirmed by laboratory testing, the other is a probable case based on close contact with the confirmed case and illness compatible with mumps.
Neither case has a connection with the recent cluster of mumps cases associated with Chapman University. Thirteen cases have been identified in Chapman University students, with illness onset dates ranging from January 28-April 18, 2017.