Measles cases in Texas rise to 663 amid outbreaks in other US states

Texas officials say 87 patients hospitalized as researchers say country at tipping point for return of endemic measles

Measles cases in Texas rose to 663 on Tuesday, according to the state's health department, an increase of 17 cases since 25 April, as the US battles one of its worst outbreaks of the previously eradicated childhood disease.

Cases in Gaines county, the center of the outbreak, rose to 396, three more from its last update on Friday, the Texas department of state health services said.