Vaccination provides long-lasting 97% protection against measles infection. Most people who have been vaccinated do not need to be vaccinated again.

For those who were vaccinated for measles many decades ago, there’s a chance the protection has worn off by now. Here's how to determine whether you need a booster.

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.