Orange County officials warned Wednesday that a woman with measles may have exposed others in the region to the contagious disease.

The patient, the first to come down with measles this year in the county, lives in Placentia and contracted the illness when she traveled to a country with an outbreak, officials said. They did not say whether she had been vaccinated against measles.

This patient appears to have gone to work for a few days and seen a movie — likely the opening night midnight showing of “Avengers: Endgame” in Fullerton — before realizing she was sick.

The warning comes amid several major measles outbreaks nationwide and the highest number of measles cases across the nation in more than two decades. Officials in L.A. County declared an outbreak last week.


“Measles is a highly contagious and potentially severe disease that causes fever, rash, cough and red, watery eyes,” said Orange County interim health officer Dr. Nichole Quick in a statement. “The MMR vaccine is a simple, inexpensive and very effective measure to prevent the spread of this serious virus.”

Measles spreads through coughing and sneezing, but the virus can linger in the air for two hours after the sick person leaves the room, still infectious.

People can spread measles for four days before they develop a rash.

Officials say people who were at the following locations should review their vaccination history and also monitor themselves for measles symptoms:


5 Hutton Centre Drive, Santa Ana, between 7:45 a.m. and 7:15 p.m. on April 23, 24 and 25.

AMC movie theater, 1001 S. Lemon St., Fullerton, from 11 p.m. April 25 to 4 a.m. April 26.

St. Jude Medical Center emergency department, 101 E. Valencia Mesa Drive, Fullerton, from 7 to 9 a.m. April 27.

Almost all cases of measles in the U.S. begin with people who traveled to countries where measles is prevalent.

The problems in L.A. County began when a resident visited Vietnam earlier this year and contracted measles, officials said. That person then spread measles to three other people in L.A. County.

In California, 14 of 38 people with measles this year became sick while visiting other countries, including India, Thailand, the Philippines, Vietnam, Cambodia and the Ukraine, according to state health officials. Four of those people infected 22 other people in the state, most of whom weren’t vaccinated, they said.

soumya.karlamangla@latimes.com


Twitter: @skarlamangla