Twelve cases are confirmed across Texas and New Mexico. See where they are, the threat to dogs and cats and the new FDA-cleared treatment.

A fight is ramping up against the New World screwworm fly as it spreads to the United States, and, in what sounds like science fiction, it lays eggs that hatch into flesh-eating parasites.

Alan Cain, head of the Texas Parks and Wildlife Department, spoke directly to these anxieties on Monday, according to Texas Public Radio.