📌 KWIK SUMMARY
| Aspect | Details |
|---|---|
| FDA Authorization Date | March 10, 2026 |
| Product | F10 Antiseptic Wound Spray with Insecticide |
| Active Ingredients | Benzalkonium chloride, polyhexanide, cypermethrin |
| Authorized Species | Cattle, horses, hoof stock, raptors, wild birds, pet birds, captive wild, exotic, and zoo mammals. |
| Primary Use | Prevention and treatment of New World screwworm (myiasis). |
F10 Antiseptic Wound Spray with Insecticide is an FDA-authorized topical spray used to prevent and treat New World screwworm (myiasis) in cattle, horses, minor hoof stock, raptors, wild and pet birds, and captive exotic mammals. It contains three active ingredients, benzalkonium chloride, polyhexanide, and cypermethrin, and is available over the counter without a prescription.
On March 10, 2026, the FDA issued an Emergency Use Authorization (EUA) for F10 Antiseptic Wound Spray with Insecticide, making it the first product authorized for NWS treatment in species beyond cattle.
What Is New World screwworm (NWS)?
New World screwworm (Cochliomyia hominivorax) is one of the most devastating parasitic pests affecting animals worldwide. Understanding this parasite is crucial for prevention and early treatment.
How Does NWS Affect Animals?
When NWS fly larvae (maggots) burrow into living flesh, they cause severe, often life-threatening damage. This screwworm parasite feeds on healthy tissue rather than dead tissue, making early detection and treatment especially important.
The name "screwworm" comes from the maggots' distinctive feeding behavior - the larvae burrow progressively deeper into living tissue using sharp mouth hooks, causing wounds to rapidly enlarge and worsen as they feed and burrow deeper.
The progression occurs rapidly:
- Multiple maggots hatch and feed simultaneously.
- Wounds rapidly enlarge and deepen.
- Tissue destruction becomes extensive and severe.
- Without treatment, infections can be fatal.
Which Animals Are Most at Risk for New World screwworm?
NWS can infect :
- Livestock (cattle, sheep, goats, horses)
- Pets (particularly those traveling internationally)
- Wildlife (deer, wild mammals)
- Birds (occasionally)
- Humans (extremely rare cases)
How Do You Identify an Adult New World screwworm Fly?
Recognizing the adult fly is the first line of defense. Early identification can prevent infestations before they start.
| Feature | Characteristics |
|---|---|
| Size | About the size of a common housefly or slightly larger. |
| Eyes | Orange (distinctive identifying feature). |
| Body Color | Metallic blue or green. |
| Markings | Three dark stripes running along the back. |
Warning Signs in Infected Animals
Watch for these critical indicators:
- Irritated behavior : Unusual restlessness or agitation.
- Head shaking : Frequent or repetitive head movements.
- Smell of decay : Strong, unpleasant odor near wounds.
- Visible maggots : Presence of fly larvae in any wound.
Any of these signs requires immediate veterinary attention.
F10 Antiseptic Wound Spray: Product Details
Product Composition
F10 Antiseptic Wound Spray with Insecticide is an amber-colored topical spray with a slight alcohol odor containing three active ingredients:
| Active Ingredient | Concentration |
|---|---|
| Benzalkonium chloride | 0.405 g/100 mL |
| Polyhexanide | 0.03 g/100 mL |
| Cypermethrin | 0.25 g/100 g |
Important : F10 Antiseptic Wound Spray with Insecticide is not authorized for use in domestic dogs or cats. Dog and cat owners should consult their veterinarian for appropriate new world screwworm treatment options that are safe and approved for their pets.
Authorized Use
- Prevention of NWS infestations in approved species.
- Treatment of active NWS myiasis infections.
- Previously indexed for general wound care and fly strike in certain species.
Food Safety Guidelines for Treated Animals
The FDA carefully evaluated food safety implications. Food products from treated animals are safe for human consumption when the following conditions are strictly followed:
Withdrawal Periods
| Animal Type | Requirement |
|---|---|
| Cattle, goats, sheep | Cannot be slaughtered for human consumption within 30 days of treatment. |
| Non-domesticated hoof stock (deer, elk, antelope, nilgai) | Use only if certain animals won't be harvested/slaughtered within 30 days. |
| Milk from treated animals | Cannot be used for human consumption during treatment and for 10 days after. |
| Pre-ruminating calves | No withdrawal period established; calves cannot be processed for veal. |
Application Instructions for F10 Antiseptic Wound Spray with Insecticide
Before You Apply:
- Wear disposable gloves.
- Work in well-ventilated areas only.
- Clean the wound thoroughly before application.
- Wash hands thoroughly after use.
How to Apply?
- Hold the spray 4-8 inches away from the wound for full coverage.
- Spray only the wound site - avoid surrounding healthy skin.
- Apply a maximum of 1-2 sprays per wound.
- Maximum 5 applications per animal with multiple wounds.
- Repeat once weekly if necessary or as directed by veterinarian.
Note : Resistance to cypermethrin has been reported in some New World screwworm wound populations in South America. Monitor wound healing closely and consult your veterinarian if the wound is not improving as expected.
Side Effects to Watch For
Possible side effects include hives, itchiness, and hair loss. If any of these occur, discontinue use immediately and contact your veterinarian.
Prevention Strategies for New World screwworm
- Monitor regularly - Watch signs of screwworm infestation in pets and livestock.
- International travel - Inspect pets traveling internationally for screwworm.
- Safe handling - Handle livestock carefully and inspect pens/equipment for sharp objects that cause wounds.
- Immediate treatment - Treat umbilical cords of newborns and all wounds promptly with approved insecticides.
- Parasite protection - Protect animals from other wound-causing parasites like ticks as part of a comprehensive livestock parasite control program, reducing wound opportunities that attract screwworm flies.
Conclusion
The FDA's Emergency Use Authorization for F10 Antiseptic Wound Spray with Insecticide marks a critical advancement in New World screwworm infection management. This new option provides veterinarians and animal owners with an effective tool across a broader range of species than previously available.
Remember: Early detection, prompt treatment, and consistent prevention practices are your best defense against this devastating parasite. Check every new world screwworm wound carefully, follow FDA guidelines, respect withdrawal periods for food-producing animals, and consult your veterinarian if you suspect any New World screwworm infestation.
