Much of the outbreak is concentrated in the districts of Texas House leaders, including Speaker Dustin Burrows. The crisis appears to have done little to change support for “vaccine choice.”

More Texans have been receiving the measles vaccine amid the outbreak that began in the South Plains region, but experts believe that more shots must be given to contain the crisis that has sickened hundreds and killed two children in Texas.

Robert F. Kennedy Jr. made a stop in Texas on Sunday to visit the family of a 6-year-old girl who died in February after contracting the measles.