As measles — a preventable disease the U.S. considered eliminated in 2000 — spreads through West Texas’ rural expanse, Klassen is sticking to an approach on vaccines that is a key tenet for Mennonites. Family leaders are the top decision-making authority — not outside recommendations, certainly not government mandates.

The US Centers for Disease Control and Prevention is on the ground in Texas to respond to the growing measles outbreak. The agency posted on X that it’s partnering with the Texas Department of State Health Services.

Robert F. Kennedy Jr., the H.H.S. secretary, claimed that doctors had successfully treated children with unconventional remedies, including cod liver oil.