The emergence of New World screwworm in the U.S. creates a threat for veterinarians, livestock producers and pet owners that has not been seen north of the Florida Keys since the fly was eradicated from the United States more than 50 years ago.ii New World screwworm (Cochliomyia hominivorax) larvae feed on living tissue and can affect a wide range of warm-blooded animals, including livestock, companion animals, wildlife, and even humans.ii
“New World screwworm could have a devastating impact on animal health, welfare, and producer livelihoods,” said Jeff Simmons, President and CEO, Elanco Animal Health. “We want to thank the FDA, EPA and USDA, for all their work to prepare for this threat. We’re committed to supporting our customers during this challenging time by delivering innovation, scientific expertise, and available resources to help treat New World screwworm and support the health and well-being of animals.”
With more than 70 years of animal health experience, including helping mitigate, prevent and treat New World screwworm in other parts of the world, Elanco is working alongside the U.S. animal health industry to help them fight against this parasite, offering a portfolio of options for pets and livestock that can help treat New World screwworm larvae infestations.
Available Elanco Treatment and/or Prevention Options
| Product Name | Indication | Species | Regulatory Status | |
| Credelio Quattro™- CA1 (lotilaner, moxidectin, praziquantel, and pyrantel chewable tablets) | Treats New World screwworm larvae infestations | Dogs | FDA Conditional Approval | |
| Credelio™ (lotilaner) | Treats New World screwworm larvae infestations | Dogs | FDA Emergency Use Authorization (EUA) | |
| Credelio™ CAT (lotilaner) | Treats New World screwworm larvae infestations | Cats | FDA Emergency Use Authorization (EUA) | |
| Negasunt™ Powder (coumaphos, propoxur, and sulfanilamide topical powder) | Treats and Prevents New World screwworm larvae infestations | Variety of Livestock and other Species | FDA Emergency Use Authorization (EUA) | |
| Tanidil™ (Coumaphos, Propoxur) | Prevents and Controls New World screwworm larvae infestations | Variety of Livestock and other Species | EPA Section 18 Emergency Exemption | |
| Catron® IV (Permethrin) | Kills and controls screwworm fly and maggots | Livestock | EPA Approved | |
Negasunt Powder and Tanidil will be available only through the U.S. Animal Plant Health and Inspection Service (APHIS) and its National Veterinary Stockpile. They will be distributed in coordination with state animal health officials and federally recognized tribal agencies. In the near future, APHIS will share additional information about the requirements for use, including tracking and reporting requirements and required safety and personal protective equipment.
As New World screwworm enters the United States, Elanco is committed to working alongside producers as they continuously evolve management practices and to help them implement prevention and treatment protocols to use the right product at the right time.
To learn more about Elanco’s ongoing efforts and historical perspective on New World screwworm, please visit our previous coverage:
- Elanco’s Negasunt™ Powder (Coumaphos, Propoxur, Sulfanilamide Topical Powder) and Tanidil™ (Coumaphos, Propoxur) Receive Emergency Authorization for Use Against New World Screwworm in Livestock
- Elanco’s Credelio Quattro™-CA1 (lotilaner, moxidectin, praziquantel, and pyrantel chewable tablets) Receives First FDA Conditional Approval for Treatment of New World Screwworm in Dogs
- Elanco’s Credelio™ CAT (lotilaner) Receives First FDA Emergency Use Authorization (EUA) for Treatment of New World Screwworm (NWS) in Cats
- Elanco’s Credelio™ (lotilaner) Receives First Ever FDA Emergency Use Authorization (EUA) against New World Screwworm (NWS) in Dogs
To learn more about New World screwworm (NWS) using the following resources:
