An unvaccinated New Mexico man tested positive for measles after death, becoming what health officials say could be the second death reported in the ongoing outbreak that has infected over 160 people in at least nine states.

An unvaccinated New Mexico adult who tested positive for measles has died, the second death in a growing outbreak centered along the Texas-New Mexico border, officials said Thursday. The individual did not seek medical care before death,

The patient tested positive for the infection, but state health officials could not confirm that it was the cause of death.