Health and Human Services Secretary Robert F. Kennedy Jr., a notorious vaccine skeptic, has backed the measles vaccine amid the deadly Texas outbreak.

A child’s death this past week in Texas is the first U.S. death from measles, a highly contagious but preventable respiratory disease since 2015, according to the U.S. Centers for Disease

Measles has been spreading across the U.S. for the last several weeks, sickening people in at least nine states amid a growing outbreak in western Texas. Several people have been hospitalized and at least one unvaccinated school-aged child in Texas has died,