If you've already been vaccinated for measles, do you need to get a booster now that it's spreading in the US?

A hospital in Texas on Wednesday confirmed the death of an unvaccinated child who was infected with measles—the first fatality in a two-state measles outbreak that began in January, according to the Associated Press.

The measles outbreak in Texas appears to have spread into neighboring New Mexico, a fact that U.S. Health and Human Services Secretary Robert F. Kennedy Jr. dubbed concerning. Cases have also been detected in other states.