FDA Authorizes Emergency Drug To Help Treat New World Screwworm in Dogs
The USDA had confirmed a total of 46 animal cases in Texas and New Mexico, with experts preparing for the threat to spread.
Federal officials authorized an emergency use of Simparica Trio, a monthly chewable medication, to treat New World screwworm infestations in dogs on August 13. The drug, made by Zoetis, is not authorized for prevention but is effective against the parasitic fly's larvae, which feed on living tissue. New World screwworm larvae hatch within 24 hours of being laid by female flies around wounds or body openings and can cause rapidly enlarging, deepening wounds, severe pain, and tissue destruction.
If left untreated, a dog can become critically ill within 24 to 72 hours. Symptoms include rapidly expanding wounds, swelling, redness, drainage, foul odors, and visible larvae, particularly around the ears, mouth, and nose or beneath thick or matted fur. Pet owners should watch for these signs and seek veterinary care immediately if they suspect an infestation.
Simparica Trio contains sarolaner, an ingredient that is reasonable to believe may be effective against New World screwworm myiasis when used as authorized. Treatment typically involves prompt veterinary care, including larvae removal, wound management, and supportive therapy. The medication, available only by prescription, does not replace other aspects of treating an infestation.
Most U.S. dogs currently face a low risk due to their geographic location, but pet owners living in, traveling to, or returning from areas with infestations should be vigilant and monitor their pets closely.
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