Vigilance and early intervention are key to minimizing animal injury and limiting the parasite's spread, according to Elanco's technical experts
Emergency Use Authorization for Elanco's CLiK Extra provides livestock producers with a vital tool in the prevention of New World screwworm infestations.
Elanco also offers producers Negasunt Powder (coumaphos, propoxur, and sulfanilamide topical powder) and Tanidil, which received emergency authorizations earlier this year, as well as EPA-registered Catron IV.
Elanco's technical experts emphasize "eyes on livestock" and early intervention are the most effective ways to minimize animal injury and prevent the parasite's spread.
INDIANAPOLIS, IN / ACCESS Newswire / August 11, 2026 / Elanco Animal Health Incorporated (NYSE:ELAN) has announced it has received Emergency Use Authorization (EUA) from the U.S. Food and Drug Administration (FDA) for CLiK?Extra?(dicyclanil?topical suspension) wound spray for application on or around wounds?to prevent infestations of New World screwworm (Cochliomyia hominivorax) larvae (myiasis) in sheep, cattle, goats, swine and camelids, as well as captive and captured cervids, American bison, bighorn sheep and Sonoran pronghorn.
Livestock producers and veterinarians can apply Elanco's CLiK Extra spray on or around wounds, including those associated with birth and following surgical procedures, on animals to help prevent infestations of New World screwworm larvae before they occur. However, if a wound is already infested or an infestation develops after administration, alternative treatment will be necessary since CLiK Extra has not been shown to treat active New World screwworm infestations.
Elanco's Negasunt?Powder and?Tanidil?received emergency authorizations for prevention and treatment of New World screwworm earlier this year. These products will be available only through the U.S. Animal Plant Health and Inspection Service (APHIS) and?its National Veterinary Stockpile as distributed in coordination with state animal health officials and federally recognized tribal agencies.?
Elanco also offers producers Catron IV, one of the few EPA registered products labeled for treatment against screwworm in a variety of livestock species. This screwworm and ear tick spray can help producers kill and control screwworm flies and maggots on beef and dairy cattle, sheep, goats, hogs and horses.
The reentry of New World screwworm into the U.S., which was confirmed by the United States Department of Agriculture in June, poses a critical risk to farmers and ranchers, pet owners and the veterinary community.i Unlike other pests, screwworm larvae aggressively consume the living flesh of their hosts, making them a danger to any warm-blooded animal, ranging from livestock and companion animals to wildlife and humans.ii
"Education is a producer's most powerful tool in this fight," says Dr. M. Wayne Ayers, DVM, Senior Technical Consultant for Elanco. Ayers advises that staying informed through trusted experts and knowing exactly where the fly is active are top priorities.
"The second pillar of protection is prevention," he says. "By checking animals as often as possible and using appropriate wound care for any noticeable lesions or sores, producers can potentially avoid conditions that might lead to New World screwworm larvae infestations. Speed is crucial. It minimizes injury to the animal, lowers the risk of death, and most importantly, prevents the next generation of flies from completing their lifecycle and expanding the outbreak."
"Now that New World screwworm is back in the United States, we want producers to know they don't have to figure this out alone," Ayers continued. "Elanco is here to help. We can look at your current situation to help you see where you can sharpen your protocols and ensure you're reaching for the right product at exactly the right moment to protect your animals."
CLiK Extra will be available for purchase by animal health professionals, livestock producers and those managing captive and captured wildlife through standard product channels.?
To learn more about New World screwworm using the following resources:?
Screwworm.gov
USDA NWS Alert and Fact Sheet?
NCBA NWS Resources?
FDA Information for Veterinarians on NWS?
Emergency Use Authorization of?CLiK?Extra (dicyclanil?topical suspension)?Wound Spray?for New World Screwworm (NWS)
The U.S. Food and Drug Administration (FDA) has issued an Emergency Use Authorization (EUA) for the emergency use of the unapproved product?CLiK?Extra?for application on or around wounds?for the prevention of infestations caused by New World screwworm (Cochliomyia?hominivorax) larvae (myiasis) in sheep, cattle, goats, swine, camelids, and the following captive?and?captured wildlife species: cervids, American bison, bighorn sheep, and Sonoran pronghorn. CLiK?Extra is not approved for this use.?
For?additional?information on the EUA?and for complete safety information, please refer to the?CLiK?Extra?NWS Fact Sheet.?
Limitations of Authorized Use?
It is a violation of Federal law to use this drug product other than as directed in the fact sheet.?
Sheep, cattle, goats, swine, cervids, American bison, and bighorn sheep must not be slaughtered or harvested for human consumption within?86?days?of treatment.?
For captured cervids,?captured?American bison, and?captured?bighorn sheep, use only when there is a reasonable certainty that the treated animal will not be slaughtered or harvested for human consumption within?86 days?of treatment.?
Treated Sonoran pronghorn and camelids may not be used for human consumption.
A milk discard time has not been?established?for this product. Do not?use in?animals producing milk for human consumption.?
A withdrawal period has not been?established?for this product in pre-ruminating calves. Treated calves and calves born to treated cows must not be processed for veal.?
CLiK?Extra is authorized for this use only for the duration of the declaration that circumstances exist justifying the authorization of the emergency use of CLiK Extra under Section 564(b)(1) of the Federal Food, Drug, and Cosmetic Act (FD&C Act), 21 U.S.C. § 360bbb-3(b)(1), unless the declaration is terminated or the authorization is revoked sooner.
Additional Important Safety Information
Not for use in humans. Keep out of reach of children.?Use?disposable gloves and protective clothing when handling?this?product, and?wash hands after use.?In case of accidental?ingestion, do not induce vomiting; seek medical advice?immediately.?For?external?use?only.?CLiK?Extra will not treat an active NWS infestation.?If a wound is already infested, or an?infestation develops after?CLiK?Extra administration, alternative treatment?for the animal?is necessary.?Treated animals?should?be kept away from surface waters for at least one hour after treatment due to serious risk?to?aquatic life.?
Emergency Use Authorization?of?Negasunt?Powder?(coumaphos, propoxur, and sulfanilamide topical powder)?for New World Screwworm (NWS)?
WARNING: Neurotoxicity.?Read full?Fact Sheet?for complete information.??
Coumaphos?and propoxur can cause neurotoxicity. May be fatal if swallowed. May be fatal if inhaled. Harmful if absorbed through skin.?Causes?moderate eye irritation. Do not breathe dust. Avoid contact with eyes, skin, or clothing.???
Use only with appropriate personal protective equipment?(PPE): coveralls worn over long-sleeve shirt and long pants, shoes, socks, and protective eyewear; chemical-resistant gloves made of??barrier laminate, butyl rubber (= 14 mils), nitrile rubber (=14 mils), neoprene rubber (>14 mils), natural rubber (=14 mils), polyethylene, polyvinyl chloride (PVC) =14 mils, or Viton (>14 mils); and a minimum of a NIOSH-approved elastomeric half mask respirator?consisting of protection factor (PF) 10 fitted?with organic vapor (OV) cartridges and combination??R or P filters; or a NIOSH-approved gas mask with OV canisters; or a NIOSH-approved powered air purifying respirator with OV cartridges and combination HE filters.???
This product is toxic to mammals, birds, fish, and aquatic invertebrates.??
The U.S. Food and Drug Administration (FDA) has issued an Emergency Use Authorization (EUA) for the emergency use of the unapproved product?Negasunt?Powder for the prevention and treatment of infestations caused by New World screwworm (Cochliomyia?hominivorax) larvae (myiasis) in cattle, swine, goats, sheep, horses, donkeys, domestic hybrid equids, and captive wild, exotic, and zoo mammals.?Negasunt?Powder is not approved for this use.?
For use by employees of federal, state, local, and federally recognized tribal agencies, and persons working under their authority and?at?their direction.?Also?for use by or on the order of a licensed veterinarian in NWS infested zones and adjacent surveillance zones as defined by the U.S. Department of Agriculture (USDA).??
For?additional?information on the EUA and for complete safety information, please refer to the?Negasunt Powder NWS Fact Sheet.?
Limitations of Authorized Use??
It is a violation of federal law to use this drug product other than as directed in the authorized Fact Sheet.??
Treated animals must not be slaughtered for human consumption within?28 days?of the last treatment.??
A milk discard time has not been?established?for this product; do not use in animals producing milk for human consumption.??
A withdrawal period has not been?established?for this product in pre-ruminating calves; treated calves and calves born to treated cows must not be processed for veal.??
Do not?use in?horses intended for human consumption. Do not?use in?domestic indoor pets (e.g., dogs, cats, rodents, rabbits) nor in residences. Do not?use?in birds. Do not?use?in free-ranging wildlife.??
To avoid overexposure, each individual person cannot treat more than 3 large wounds (>2?inches diameter) a day or more than 30 small superficial wounds (=2 inches diameter) a day (or an equivalent thereof) with?Negasunt?Powder or any other?coumaphos-containing products.???
Negasunt?Powder is authorized for this use only for the duration of the declaration that circumstances exist justifying the authorization of the emergency use of?Negasunt?Powder under section 564(b)(1) of the Federal Food, Drug, and Cosmetic Act (FD&C Act), 21 U.S.C. § 360bbb-3(b)(1), unless the declaration is terminated or the authorization is revoked sooner.??
Federal law prohibits the extra-label use of this drug.?
Additional?Important Safety Information?
Not for use in humans. Keep out of reach of children. Only handlers wearing?required?PPE may be in the area during application.??Do not apply in a confined, non-ventilated area; provide thorough ventilation. Call a poison control center or doctor?immediately?for treatment advice if?Negusant?Powder is swallowed, inhaled, on skin or clothing, or in eyes. Sulfonamides are contraindicated in animals that are hypersensitive to them and in animals with severe renal or hepatic impairment. For external use only on animals.??Do not contaminate water, feed, troughs, feed handling equipment, or milk or meat handling equipment.?Use with?caution in?very young, weak, or debilitated animals.??In the case of overdose,?treat with atropine sulfate or?pralidoxine?chloride (2-PAM) as soon as possible. The most common adverse reactions associated with organophosphate and carbamate toxicity in animals include frequent urination and defecation, muscle twitching, and watering eyes.?
Important Information about Tanidil?
Tanidil is an unregistered product for distribution and use only under a Section 18 emergency exemption. The Section 18 labeling must be in the possession of the user at the time of pesticide application.?This product may only be used to prevent or control New World?screwworm?in and on animal wounds on labeled animal host species.?
For use only by federal, state, local, and federally recognized tribal agencies, and persons working under their supervision; personnel at quarantine stations and areas; veterinarians; veterinarians or certified applicators at livestock and game facilities, zoos, wildlife facilities, animal rehabilitation centers; and wildlife professionals.??
Read the entire label. This product must be used strictly?in accordance with?this label's precautionary statements and use directions, as well as with all applicable state and federal laws and regulations. Please visit the?Tanidil fact sheet?for more information.?
Use Period: This exemption is effective on April 27,?2026?and expires on April 27, 2029. No applications of?Tanidil?may be made under the emergency exemption before its effective date or after its?expiration?date.??
ABOUT ELANCO
Elanco Animal Health Incorporated (NYSE:ELAN) is a global leader in animal health dedicated to innovating and delivering products and services to prevent and treat disease in farm animals and pets, creating value for farmers, pet owners, veterinarians, stakeholders and society as a whole. With 70 years of animal health heritage, we are committed to breaking boundaries and going beyond to help our customers improve the health of animals in their care, while also making a meaningful impact on our local and global communities. At Elanco, we are driven by our vision of Food and Companionship Enriching Life and our purpose - all to Go Beyond for Animals, Customers, Society and Our People. Learn more at?www.elanco.com.
Catron IV, CLiK Extra, Negasunt,?Tanidil, Elanco and the diagonal bar logo are trademarks of Elanco or its affiliates. © 2026 Elanco or its affiliates?
PM-US-26-1426
i USDA Confirms Presence of New World Screwworm in the United States | Animal and Plant Health Inspection Service
ii New World Screwworm." www.aphis.usda.gov, www.aphis.usda.gov/livestock-poultry-disease/cattle/ticks/screwworm.
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