Los Angeles County Health Officials Warn Potential Measles Exposure at Southern California Theme Park

The Los Angeles County Department of Public Health said anyone who visited a Southern California theme park between 10 a.m. and 9 p.m. on July 26 could have been exposed to measles. The department is also looking into possible exposures at other locations.

People potentially exposed may develop symptoms anywhere from seven to 21 days after contact, officials noted. The agency highlighted that most recent measles cases in the United States involve individuals who are unvaccinated or whose vaccination status is unknown.

Nationwide, 2,371 measles cases had been confirmed as of July 31, marking a rise in infections linked to ongoing outbreaks. January recorded the highest number of cases since the United States declared measles eliminated in 2000, according to county health officials. California has already reported twice as many cases this year as in 2025.

A study published in the journal Nature Health identified two Southern California counties as "very high risk" for measles based on local MMR vaccination estimates. Health officials advised residents to check their immunity, watch for symptoms such as fever, cough, runny nose, red eyes and a spreading rash, and to consult a health-care provider if they are not immunized. Those potentially exposed should remain at home and limit interactions for up to 21 days after exposure.