06/05/2026
Here We Go Folks.......buckle up
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The threat of the New World screwworm (Cochliomyia hominivorax) has arrived in the US.
A US case was just confirmed in Zavala County, about 50 miles from the border. It was found in a 3 week old calf.
So, what is the New World Screwworm? Unlike regular old blowflies that feed on dead tissue, the female screwworm fly lays her eggs exclusively in the open wounds or mucous membranes of living, warm-blooded animals (including livestock, wildlife, pets, and occasionally humans).
Once hatched, the larvae (maggots) use sharp mouth hooks to literally "screw" deep into the living flesh, expanding the wound. If left untreated, an infestation can become fatal in as little as 7 to 10 days.
Because early-stage larvae burrow completely beneath the skin, they are difficult to see during the first 1 to 3 days. Instead of looking for surface crawling, watch your animals for these critical warning signs…
-Behavioral changes: Intense irritation, scratching, or continuous head-shaking.
-Wound appearance: An unhealed injury that produces a foul, decaying odor or bloody discharge. The smell is awful and unmistakeable.
-Physical indicators: Enlarged or unusually deep wounds, particularly around newborn navels, tick bites, branding sites, dehorning cuts, or vulvas.
Vigilance is our best defense to keep the parasite from establishing a population on American soil. Inspect your animals daily, delay non-essential surgical procedures (like branding or dehorning) if you are near the border, and treat even minor scratches immediately.
If you suspect an infestation, do not throw any larvae in the trash or on the ground, as this can spread the pest. Collect a sample in a leak-proof container filled with rubbing alcohol, contact your veterinarian, and report it immediately.
Note for travelers and pet owners: All southern U.S. ports of entry are currently closed to live livestock trade from Mexico, and international pets must undergo strict health inspections to ensure they aren't carrying the parasite.
