An adult who was infected with measles has died in New Mexico, state health officials announced Thursday, though the virus has not been confirmed as the cause.

Nearly 230 measles cases have been identified in outbreaks in West Texas and a nearby New Mexico county. One hundred ninety-eight measles cases have been reported in the West Texas outbreak, the Texas Department of State Health Services said in an update Friday — 39 more confirmed cases since an update on Tuesday.

New Mexico health officials say an unvaccinated adult has died after a measles infection, though the virus has not been confirmed as the cause. The death comes as cases rise in Texas and New Mexico, prompting the CDC to send a response team.