VX

Buoyed by the results, which are yet to be published or presented at a meeting, Vertex plans to apply to the Food and Drug Administration by midyear for approval to market the drug, a pill that, for now, is called VX-548.

In 2022, the last M55 rocket with the VX nerve agent was destroyed at the plant in Kentucky.

The Kentucky storage facility has housed mustard agent and the VX and sarin nerve agents, much of it inside rockets and other projectiles, since the 1940s.

Others held nerve agents developed later, like VX and Sarin, that are lethal even in tiny quantities.

Under pressure from Congress, military leaders acknowledged that the Army had been testing VX nearby, that it was storing chemical weapons at facilities in eight states and that it was testing them in the open air at a number of locations, including one site 25 miles from Baltimore.