Screwworm’s Return Puts Stock Producers on High Alert

The New World screwworm is not the sort of pest that politely nibbles around the edges. Its larvae feed on living tissue, which makes it a serious threat to cattle, sheep, goats, horses, pets, wildlife, and just about any warm-blooded animal unlucky enough to carry an open wound.

According to the report, 33 infections have been confirmed in Texas and New Mexico since early June. That number is small compared with the scale of U.S. livestock production, but screwworm is a pest where early response matters enormously. Left untreated, infestations can become fatal, and outbreaks can spread through livestock movement, wildlife, and unmanaged wounds.

For ranchers, the practical message is simple: inspect animals more often, especially after branding, calving, dehorning, shearing, castration, or any injury that breaks the skin. Watch for wounds that seem to worsen quickly, foul odor, excessive licking, restlessness, or visible larvae. This is one of those cases where a five-minute look in the chute can save a whole heap of trouble later.

Biosecurity also becomes a neighborly duty. Producers should document suspect cases, contact veterinarians or animal health officials quickly, and avoid moving animals that may be infected. Quarantine decisions are never fun, but neither is letting a pest hitchhike down the road like it owns the place.

The broader lesson is that old livestock threats can reappear when conditions allow. Climate shifts, animal movement, border pressures, and wildlife reservoirs all complicate the map. Good animal husbandry has always involved eyes, fences, records, and timely care — and with screwworm back in the conversation, those basics are worth sharpening like a good hoof knife.