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.

The person who died was unvaccinated and did not seek medical care, a state health department spokesperson said in a statement. The person's exact age and other details were not immediately released.

The person was from Lea County, just across the state line from the West Texas region where 159 measles cases have been identified and a school-age child died last week. New Mexico health officials have not linked the outbreak there to the Texas cases.