A sign explaining the local state of emergency is displayed at the Rockland County Health Department in Pomona, N.Y., Wednesday, March 27, 2019. The county in New York City's northern suburbs declared a state of emergency Tuesday over a measles outbreak that has infected more than 150 people since last fall, hoping a ban against unvaccinated children in public places wakes their parents to the seriousness of the problem. (AP Photo/Seth Wenig)