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,

A New Mexico resident who tested positive for measles is being reported as the second death of the virus after an outbreak in Texas killed an unvaccinated school-aged child. The New Mexico Department of Health (NMDOH) reported Thursday that the person was unvaccinated and the official cause of death is still under investigation.