06/05/2026
FLESH-EATING PARASITE DETECTED IN US: LIVESTOCK AND EQUINE INDUSTRIES ON HIGH ALERT.
While the initial detection occurred in cattle, the equine industry is rapidly mobilizing. The US Equestrian Federation (USEF) and veterinary experts are warning horse owners nationwide that this parasite poses an immediate, lethal threat to horses, mules, and donkeys.
The U.S. Department of Agriculture’s (USDA) Animal and Plant Health Inspection Service (APHIS) confirmed the detection of a New World screwworm (NWS) in a bovine in La Pryor (Zavala County) Texas on June 3, 2026. NWS is a parasite that affects livestock, pets, wildlife, and less commonly, people and birds.
Screwworms thrive in tropical and subtropical climates. They do not tolerate prolonged periods of very dry hot or very cold weather. Unlike a virus, NWS doesn’t spread between animals, and infestations are easy to recognize. Rapid spread in a country is mainly due to humans moving infested animals over large distances.
The Threat to Equines: Living Flesh Under Attack
Unlike standard blowfly maggots that consume dead tissue, screwworms target living flesh. Female flies are attracted to any open wound, no matter how minor.
* Infection Points: Minor pasture scrapes, fence gashes, tick bites, summer sores, and surgical sites (such as recent castrations) serve as primary targets.
* The Damage: Once eggs hatch, the larvae use specialized mouth hooks to bore deep into healthy muscle tissue.
* Fatal Progression: Left untreated, infestations cause severe pain, extensive structural tissue damage, systemic toxicity, and can result in the animal's death within days.
Veterinary officials urge equine managers to adopt aggressive biosecurity protocols:
1. Daily Exams: Inspect every animal daily. Closely examine the ears, eyes, midline, sheath, and any recent wounds.
2. Aggressive Fly Control: Maximize the use of fly sheets, masks, and repellents.
3. Meticulous Wound Care: Clean and dress every minor scrape immediately. Utilize protective topical ointments to block fly access.
4. Isolate and Report: If a pocketed, foul smelling wound with wood screw shaped larvae is found, isolate the animal immediately. Do not attempt to flush out the wound before a veterinarian can pull official diagnostic samples for laboratory confirmation. If you suspect your animal is infected with screwworm, contact your state animal health official or USDA area veterinarian in charge immediately.
The last known infection in an equine occurred at a quarantine facility in Florida in February 2026. The horse was imported from Argentina and was discovered to have the parasite during a routine USDA inspection. The infection was contained to the facility.
Pipeline Pulls
Bernville, PA 19506
