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.

RFK Jr. has cited vitamin A and cod liver oil as effective methods of measles prevention while stopping short of outright suggesting vaccines.

In the midst of a growing measles outbreak in Texas that has killed one child, Health and Human Services Secretary Robert F. Kennedy Jr. has misleadingly focused on vitamin A, including from cod liver oil,