Texas has reported over 700 measles cases since January, according to the latest numbers from the state’s health department, representing the bulk of measles cases that have been reported in the U.S.

Three new counties have been added to the outbreak area, which has seen nine more cases over the past week, according to state data released on Friday.

An update from Texas health officials shows the state's measles outbreak has grown by 10 cases over the past week.