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

Provider Advisory: Orange County Reports Season's First Influenza CaseOctober 19, 2018
The Orange County Health Care Agency (HCA) has confirmed the county’s first case of influenza for the 2018-19 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.

OC Health Care Agency Reports West Nile Virus Related DeathOctober 16, 2018
The first human death associated with West Nile virus (WNV) infection in Orange County has been confirmed by OC Health Care Agency officials. The case is an elderly female resident of Tustin who died with WNV infection complications.

CD Connection Newsletter - SeptemberSeptember 28, 2018
Update on Pertussis in Orange County

Eye on Influenza 2018-19 Volume 15 Issue 1September 25, 2018
Influenza Season Begins September 30 - Get Your Vaccination Now!

Provider Advisory: Hepatitis A Cases With No History of Travel in Orange CountySeptember 21, 2018
Orange County Public Health has received three reports in the last month of acute hepatitis A virus (HAV) illness in persons with no recent history of travel or exposure to a known case. All three cases are male, with an age range of 30 to 65 years and illness onset dates ranging from August 14 to September 15. The three have no identified common social contacts. None report a history of injection or noninjection drug use or homelessness; one has a history of having sex with men. None report receiving hepatitis A vaccine in the past.