This month, travelers with confirmed measles cases passed through five U.S. airports and, now, health officials are warning the public, according to an ABC News report. The disease is easily spread from person to person through the air.

Cases were reported in Chicago, IL., Richmond, VA., Austin, TX., Denver, CO., and Los Angeles, CA. According to the U.S. Centers for Disease Control (CDC), there were 1,276 reported measles cases this year. In 2018, the number was nearly 30 percent less with 375 reported cases.

“Measles is an acute, highly contagious viral disease,” Dr. Mark Escott, medical director for Austin Public Health, said in a statement. “A small number of cases are capable of quickly producing epidemics.”

The CDC recommends that children receive their first MMR (measles, mumps, and rubella) vaccine between age 12-15 months and the second between age 4-6 years. The two doses are 97 percent effective, according to the CDC.

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