A flesh-eating pest is back on U.S. soil — and a proven bait system that once helped eradicate it sits unused while officials wait on slower fixes.

A flesh-eating pest is back on U.S. soil — and a proven bait system that once helped eradicate it sits unused while officials wait on slower fixes.

The New World screwworm has reached the United States, prolonging a cattle-trade crisis that is costing ranchers millions and keeping the Mexico-US border mostly closed.