U.S. Health Secretary Robert F. Kennedy Jr. has traveled to the epicenter of Texas' measles outbreak after a second school-aged child who was not vaccinated died from a measles-related illness.

A second child who was diagnosed with measles has died in Texas, marking another death in a growing measles outbreak that has so far sickened hundreds of people, hospitalized dozens and spread to nearby states.

A second child with measles in Texas has died amid an outbreak that's sickened more than 480 people in the state since January. Fifty-six of those who have gotten measles have been hospitalized as of Friday,