As Gaines County, Texas, deals with a measles outbreak, experts are reminding Americans that outbreaks like these can be avoided with available safe and effective vaccines.

As of Tuesday, 22 children and two adults had been infected, all of whom were unvaccinated, local officials said.

According to the Texas Administrative Code (TAC) Rule §97.7, schools and childcare settings shall exclude unimmunized children for at least 21 days after the last date the unimmunized child was exposed to a measles case.