Measles cases reached the highest level in 23 years in 2019, and health authorities warned that many countries aren’t vaccinating enough people amid the COVID-19 pandemic.

The global total for confirmed measles infections rose to 869,770 last year, the World Health Organization and U.S. Centers for Disease Control and Prevention said in a report released Thursday. The number of deaths soared by 50% compared with a low reached in 2016.