Health Secretary Robert F. Kennedy Jr. attended the West Texas funeral Sunday of an 8-year-old girl who died of measles. She was not vaccinated and is the second known measles death in Texas amid the current outbreak. Texas has reported over 480 cases, many of them affecting members of the Mennonite community, which has lower rates of vaccination than the general public.

During his visit to the epicenter of the outbreak, RFK Jr. posted on social media, “The most effective way to prevent the spread of measles is the MMR vaccine.” It’s his most direct comments on the vaccine yet, even as he continues to also promote unproven treatments including vitamin A.