FILE - This Wednesday, March 27, 2019 file photo shows a sign explaining the local state of emergency because of a measles outbreak at the Rockland County Health Department in Pomona, N.Y. Measles is spread through the air when an infected person coughs or sneezes. It's so contagious that 90 percent of people who aren't immunized are infected if exposed to the virus, according to the Centers for Disease Control and Prevention. (AP Photo/Seth Wenig)
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