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

First West Nile Virus Infection Identified in Orange CountyJuly 7, 2017
The first West Nile Virus infection in Orange County this year was identified this week, in a female resident of Laguna Beach in her 70s. Three additional West Nile Virus (WNV) cases have been reported in the state as of 6/30/17.

CD Connection Newsletter - JulyJuly 6, 2017
Zika Virus Update
Current Situation: California (as of June 30, 2017): There have been a total of 573 travel-associated cases since 2015. The most visited countries for reported cases include Mexico, Nicaragua, Guatemala, and El Salvador. According to the CDC, Zika transmission has not yet peaked in Mexico; travel to all areas in Mexico are considered to pose a risk for Zika virus infection.

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.