FILE - In this Wednesday, May 8, 2019 file photo, University of Pittsburgh pharmacy student Alexandria Taylor prepares syringes during a free measles vaccination clinic by the Allegheny County Health Department at the Homewood-Brushton YMCA in Pittsburgh. On Monday, May 13, 2019, U.S. health officials say the year’s count of measles cases has surpassed 800, in a growing tally that already is the nation’s highest in 25 years. (Steph Chambers/Pittsburgh Post-Gazette via AP)