The individual—whose name, age, and sex were not released by local authorities—is the second person to die from the virus amid a growing outbreak along the New Mexico-Texas border, sparking widespread concern among doctors that the federal government’s response is simply not enough to halt the spread of measles.

A measles outbreak in the American southwest has killed a second person, an unvaccinated adult, New Mexico health officials have said. The fatality comes roughly a week after measles took the life of an unvaccinated child in nearby Texas,

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.

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,

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.

The measles outbreak in Texas and New Mexico now stands at over 200 cases, according to the latest figures released by local health departments. The news comes just a day after an unvaccinated adult in New Mexico has reportedly died of suspected measles, the second death of this current outbreak.