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

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.

Adults born before 1957 are assumed to have natural immunity because they were likely exposed to measles before the vaccine was created. Adults born and vaccinated between 1957 an