People living, working or going to school in those areas who also have come into contact with someone who has measles now have three options:• Get vaccinated. How will the city know if someone was in contact with a person who has measles? This information helps doctors and health officials trace the source of an outbreak and ultimately contain it. Years ago, the number of confirmed measles cases in the United States dropped to a very low point, but the virus was never eliminated. In 2000, there were no reported cases of the disease in the United States.

Source: New York Times April 10, 2019 09:31 UTC