The number of measles cases associated with an outbreak in western Texas has grown to 259, according to new data released Friday.

Summary

The Texas measles outbreak has reached 259 cases, with nearly all infections occurring in unvaccinated individuals. Only two cases involve fully vaccinated people.

Gaines County, the epicenter, has seen vaccine exemption rates more than double over the past decade. Two measles-related deaths have been reported in the U.S., including one confirmed fatality in Texas.

The CDC has identified cases in 12 states and continues urging vaccinations.

Measles, highly contagious, was declared eliminated in 2000, but declining vaccination rates have contributed to its resurgence.