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 New Mexico resident didn't seek medical care before dying, but the person tested positive for measles, state health officials said.

An unvaccinated New Mexico resident tested positive for measles upon undergoing a medical examination after dying, but measles so far has not been declared the cause of death.

As measles cases climb nationwide, health officials are reporting a second recent death of an unvaccinated adult in New Mexico who tested positive for measles after passing, but the official cause of death is still under investigation.