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LOS ANGELES, Dec. 16 (Xinhua) -- Los Angeles (L.A.) County health officials on Monday confirmed three measles cases of non-residents who passed through Los Angeles International Airport, possibly exposing other people.

The patients were at terminals 4 and 5 of the airport on Wednesday, with the potential exposure time being from 6:50 a.m. (1450 GMT) to 12:00 p.m. (0800 GMT the next day), according to a statement from the L.A. County Department of Public Health.

There is no known current risk related to measles at the airport, according to the release. However, the department noted anyone who may have been exposed could develop symptoms as long as 21 days after exposure.

So far this year, there have been 20 confirmed measles cases among L.A. County residents, in addition to 14 measles cases from non-residents, according to the department.