Health officials in New Mexico are investigating the cause of death of an unvaccinated person who tested positive for measles, the state health department said Thursday.

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.

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.