06/13/2026
New World Screwworm Control Starts with Prevention!
In both large and small animals, screwworm flies are attracted to open wounds, cuts, scrapes, and surgical sites. Unlike common fly larvae that may infect a wound with dead tissue, screwworm larvae invade and consume living flesh, turning even small wounds into a large problem.
For Dogs:
We use and recommend NexGard, a monthly flea and tick prevention, or NexGard PLUS, a monthly combo protection for flea, tick, heartworm, and intestinal parasites. These preventions have been proven to kill larvae before they become a problem.
For Cats:
We use and recommend Revolution Plus for monthly flea and tick control in cats. The ingredients in Revolution Plus will also kill the larvae.
These products require a prescription and are aimed at preventing infection. If your pet is not currently on one of these products, please call to schedule an annual physical examination.
Prompt veterinary care, wound management, and physical removal of maggots remain essential. If you notice any suspicious wounds or maggot infestation, contact your veterinarian immediately.
For Horses and Cattle:
Check your animals daily for cuts, scrapes, surgical sites, or any draining wounds.
Treat wounds promptly. Catron® IV spray Wound Dressing, can help protect wounds from flies and is approved for use inside the wound.
Watch for signs of screwworm infestation:
• A wound that suddenly gets larger
• Foul odor or unusual discharge
• Excessive licking, biting, or irritation
• Visible maggots in a wound
Chaparral Veterinary Center is closely monitoring the situation and is here to help protect your pets and livestock. Prevention, daily observation, and prompt wound care remain our best defenses against the New World Screwworm.
