(CNN) Three unvaccinated children with measles likely exposed travelers at Denver and Los Angeles airports to the virus, health officials have warned.

The children were visiting from New Zealand and traveled through the Denver International Airport and Los Angeles International Airport on the same day, US Centers for Disease Control and Prevention press officer Scott Pauley told CNN.

Travelers who visited the Denver airport's Concourse A, train to baggage claim, west baggage claim and west level 4 passenger pick-up areas between 1:15 p.m. and 5:45 p.m. on December 11 could've been exposed to the virus, Colorado's Tri-County Health Department reported.

Los Angeles County health officials issued a similar warning for passengers who visited Terminals 4 and 5 between 6:50 a.m. and 12 p.m. on the same day.

The CDC is contacting passengers who flew on the same planes as the infected children about potential exposure, Pauley said.

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