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: 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.

Provider Advisory: Consider MERS in Returning Travelers from the Arabian PeninsulaSeptember 7, 2018
With the annual Hajj pilgrimage to Mecca, Saudi Arabia, ending on August 24, the Orange County Health Care Agency reminds providers that Middle East Respiratory Syndrome Coronavirus (MERS-CoV or MERS) illness should be considered in returning travelers who present with symptoms consistent with lower respiratory tract infection.

CD Connection Newsletter - AugustAugust 31, 2018
Salmonellosis in Orange County Overview

Provider Advisory: Increase in Mumps Cases Among Young Adults in Orange CountyAugust 23, 2018
Orange County Health Care Agency has received five reports of mumps cases among young adults since June 1, 2018. The cases ranged in age from 18-22, three of five were male.

Provider Advisory: Orange County's First West Nile Virus Human Infection of the Season ReportedAugust 8, 2018
A Tustin woman in her 70s was diagnosed this week with West Nile Virus (WNV) neuroinvasive disease. This is the first human WNV infection identified in Orange County this season. Human infections have already been reported this season in the surrounding counties of Los Angeles, Riverside, and San Bernardino.