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

Measles Cases Identified in Orange CountyApril 4, 2017
Measles was recently confirmed in two Orange County residents with no known association to each other. The first case, an adult, reported recent international travel and was most likely infected while abroad. The second case, a high school student, reported no recent travel and had no known exposures to ill contacts.

Update: Mumps Cases Identified in Chapman University StudentsMarch 31, 2017
Nine cases of mumps have been reported in students of Chapman University in the city of Orange. Six of nine cases have been confirmed by laboratory testing; the other three had symptoms consistent with mumps infection and known contact to a confirmed case. Six are law school students, three are undergraduate students. Cases ages range from 19-34, and symptom onset dates extend from January 26 to March 26. The Orange County Health Care Agency is working with the University to identify any additional cases. Multiple mumps outbreaks have been seen in college and university campuses around the country in the last several years.

Eye on Influenza NewsletterMarch 10, 2017
Severe influenza cases continue to be reported. As long as influenza
viruses are circulating, vaccination is encouraged – it is not too late!

Mumps Cases Identified in Chapman University StudentsFebruary 24, 2017
One confirmed and three probable cases of mumps have been reported in students of Chapman University in the city of Orange. All four are law school students who belong to a common social group. Symptoms onset dates range from January 28 to February 17. The Orange County Health Care Agency is working with the University to identify any additional cases. Providers should consider the diagnosis of mumps in patients with an appropriate clinical presentation, particularly in college students, those with a history of international travel, or exposure to a known mumps case. Notify the Orange County Health Care Agency Epidemiology Program immediately at 714-834-8180 with any suspect cases.

Update for Medical Providers: Apparent Mycobacterium abscessus Infections Associated with a Local Dental Clinic

February 1, 2017
Mycobacterium abscessus dental infections have been reported in patients who have undergone pulpotomy procedures at the 2156 East Lincoln Avenue office of Children's Dental Group in Anaheim.

The facility’s internal water system appears to have been the source of mycobacteria based on the Orange County Health Care Agency’s facility assessment and laboratory testing. The facility discontinued performing pulpotomy procedures from September 6-November 7, 2016 in order to replace their water system and install appropriate infection control safeguards. On December 15, 2016, after the facility had restarted performing pulpotomies, OCHCA’s Public Health Laboratory identified Mycobacterium mucogenicum growing from multiple clinical water samples obtained as part of follow up testing at the facility. Though M. mucogenicum is not known to pose the same risk to dental patients as M. abscessus, the identification of any mycobacterium (even at low levels) was of sufficient concern that the County Health Officer issued a second order requiring closure of the clinic pending further investigation of the situation.