There have already been more measles cases in the U.S. during the first three months of 2019 than in all of 2018.
There have been 387 cases through March, the Centers for Disease Control and Prevention reported Monday. There were 372 last year.
There have been several recent outbreaks in the U.S. most notably in Rockland County, New York and most recently one in Broward County.
Officials in Rockland County announced anyone who had not received at least one dose of the measles vaccine would not be permitted in indoor public places like schools, restaurants or places of worship.