Public health officials in Los Angeles County are investigating another confirmed measles case, warning that visitors at Universal Studios Hollywood on July 26 may have been exposed to the virus.
The infected person spent the entire day at the theme park, according to the Los Angeles County Department of Public Health. Authorities are now checking whether people at other locations also came into contact with the patient.
Anyone who was at the park could develop symptoms seven to 21 days after exposure, the health department said. Measles is highly contagious and spreads through the air when an infected person breathes, coughs, or sneezes. Direct contact with infectious droplets can also transmit the disease.
This is the ninth measles case confirmed in LA County this year. The count includes two in June: one infected person at Hollywood Burbank Airport and another at LAX. Earlier cases involved a traveler who arrived at LAX, visited Disneyland while infectious, and another who went to at least three restaurants while possibly contagious.
As of July 31, the Department of Public Health reported 2,371 confirmed measles cases nationwide. Most are tied to ongoing outbreaks. Southern California has already seen double the number of measles cases this year compared with 2025, and the majority of infected individuals are unvaccinated or have unknown vaccination status.
Falling vaccination rates are raising the risk across large parts of the country, according to a study published this year in the journal Nature Health. The researchers analyzed county-level MMR vaccination estimates to identify local risk levels. In Southern California, two counties fall into the “very high risk” category.
The measles vaccine was first introduced in 1963, and the combined measles-mumps-rubella vaccine has been used since 1971. Health officials urge people to check their immunity status and watch for symptoms—fever, cough, runny nose, and red eyes, followed by a rash that starts on the face and spreads.
Those who are not immunized should talk to a health care provider, stay home, and limit interactions until 21 days after exposure, authorities added.