A measles outbreak, the worst in over two decades, is sweeping the US, with Texas as the epicenter. Over 1,000 cases have been confirmed across 31 states, resulting in three deaths. Health officials are concerned about declining vaccination rates and the potential loss of the nation's measles elimination status,

Overall, the U.S. has seen more than 1,000 measles cases across 30 states since the beginning of the year, and 11 states with outbreaks — defined as three or more related cases.