Los Angeles International Airport
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Travelers at Los Angeles International Airport may have been exposed to the measles late last month, health officials warn.

An infected passenger had a layover in LAX on February 21. Travelers who were at LAX between 9 a.m. and 9 p.m. that day and traveled through Terminal B and Delta Terminal 3 may have been exposed.

The infected traveler arrived into LAX a China Eastern Airlines flight. The Los Angeles Times reports that the flight numbers correspond to a flight from Shanghai to LAX, and then LAX to San Antonio. Officials said that passengers who were seated next to the infected person will be notified separately.

Measles is highly contagious and often spread through sneezing or coughing. The viral disease is contagious from four days before and four days after the rash appears and continues to infect others two hours after the infected person leaves the room, according to County of Los Angeles Public Health. The symptoms of measles are fever, cough, red eyes, runny nose, and rash, but it can take 21 days after being exposed for the symptoms to appear. Officials say if symptoms do not develop by Thursday, LAX travelers on February 21 are no longer at risk of developing measles.

Those with the most risk are travelers who have not been vaccinated against the measles. The Centers for Disease Control and Prevention reports that the vaccine is 97 percent effective against the disease.

There is currently no known risk of catching measles at LAX.