Texas' outbreak, which has largely spread in undervaccinated Mennonite communities, could last a year, based on studies.

We would absolutely not take the MMR,” the mother of a six-year-old who died from complications stemming from the measles, told an interviewer.

Both formulations of the so-called MMR vaccine contain weakened live forms of the measles virus. The vaccine does occasionally cause mild side effects, such as swelling at the injection site, fever or a mild rash; there is no valid evidence that the MMR vaccine causes autism.