First U.S. measles death in over a decade: Unvaccinated child dies of virus in Texas outbreak that’s infected more than 120 people
Measles is a respiratory virus that can survive in the air for up to two hours. Up to 9 out of 10 people who are susceptible will get the virus if exposed.

Robert F. Kennedy Jr., US secretary of Health and Human Services (HHS), countered sharp criticisms from Democratic senators over his past questioning of vaccine safety by saying he would not stop anyone from getting polio and measles vaccines.
Tierney L. Cross / Bloomberg—Getty Images