She is also the first confirmed case of measles to hit Orange County this year. Hacker said that if someone who does not have the measles vaccination was exposed at the airport, they could get a rash between April 23 and May 7.
She is believed to be in her 20s and to have entered the theater at 11 p.m. and didn't leave until 4 a.m.
AMC Fullerton employee Carlee Greer-McNeill told NBC with exasperation: "People, if you know you have the measles, please don't come to a movie theater, let alone a public place". Officials in L.A. County declared an outbreak last week. A CDC report confirmed 38 cases of measles in California as of April 24, Mercury News reported, with 14 of those people contracting the disease travelling overseas.
Hacker said that two of the individuals have not reportedly been outside of the house while infectious and will be quarantined in their home. The Orange County Health Care agency warned that the AMC Theatre on Lemon Street in the city between the hours of 11pm and 4am on April 25 as a possible exposure spot, Mercury News reported.
The woman recently traveled to Vietnam, which officials say is experiencing "widespread measles activity".
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Measles is highly contagious, as it is airborne and can spread when an infected person coughs or sneezes.
"As of April 24, the most recent report by the CDC, 38 confirmed measles cases, including 28 outbreak-associated cases, have been reported in the Golden State", Mercury News notes.
Everyone who was in the building, not just those at the "Avengers" screening, may have been exposed to the contagious disease.
The onset of symptoms for measles generally occurs one to two weeks after exposure and begins with symptoms common to a flu or cold: fever, cough, sore throat and runny nose. "The MMR vaccine is a simple, inexpensive, and very effective measure to prevent the spread of this serious virus". Local residents are encouraged to stay up-to-date with their vaccinations.