Most of the measles cases are in West Texas, but Travis County now included in the statistics with infant diagnosed last week.

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.

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