(Seth Wenig | The Associated Press) In this March 27, 2019 file photo, signs about measles and the measles vaccine are displayed at the Rockland County Health Department in Pomona, N.Y. Measles continues to spread in the United States, with more 704 cases reported so far this year spread among 22 states. U.S. health officials on Monday, April 29 updated the national tally, which already has eclipsed the total for any full year since 1994, when 963 cases were reported.