Epidemiology & Assessment

Rates of Influenza A and B Continue to be Elevated; Orange County Reports its First Flu Death in a Person under 65 years of ageFebruary 5, 2016
Influenza continues to be elevated in Orange County and widespread in California. Orange County recently had its first report of influenza-related death in a person under 65 years of age. If you are not already vaccinated, the time is now! For more information, see the Eye on Influenza newsletter.


Zika Virus in Latin AmericaJanuary 22, 2016
In response to the ongoing Zika virus outbreak in Latin America, and reports of microcephaly in newborns born to Zika-infected mothers, the Centers for Disease Control and Prevention (CDC) and California Department of Public Health (CDPH) recommend that pregnant women consider postponing travel to areas where Zika virus transmission is ongoing. Pregnant women who must travel to one of these areas should talk to their healthcare provider first and take measures to avoid mosquito bites during the trip. For more information, see the CDPH advisory.
Download Fact Sheet in English
Download Fact Sheet in Spanish

Chikungunya and Dengue in Mexico and Latin AmericaDecember 22, 2015
Chikungunya or Dengue infections continue to occur in Mexico and Latin America. Travelers who visit these areas during the holiday season should take appropriate precautions to avoid mosquito bites during the day and at night. For more information, the California Department of Public Health Advisory can be found by clicking here.


Certain communicable diseases are required to be reported to the local health department (see List of Reportable Diseases) as per the State of California Code of Regulations. Epidemiology and Assessment (E&A) unit's medical directors, public health nurses, and epidemiologists investigate individual cases and outbreaks of reported communicable diseases. We monitor disease trends, and often provide current statistics and other information to doctors, hospitals, the public and news media. We may also provide education or preventive treatment in some circumstances. Although other units handle reports of HIV/AIDS, tuberculosis (TB) or sexually transmitted diseases (STDs), we do monitor their trends in Orange County. For more information or to report a Public Health emergency 24/7 call 714-834-8180.

Epidemiology Page Index

Additional Topics

Orange County links

More Disease Information