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August 13, 2026
The U.S. Food and Drug Administration today issued an Emergency Use Authorization (EUA) for Simparica TRIO (sarolaner, moxidectin, and pyrantel chewable tablets) for the treatment of New World screwworm (NWS) infestations (myiasis) in dogs and puppies.
Currently, most dogs in the U.S. are at low risk of NWS exposure due to their geographic location. However, dogs that live in, travel to, or return from areas where NWS infestations have been identified by state or federal animal health officials, as well as certain countries south of the U.S. border, should be closely monitored for signs of infestation, such as visible maggots or foul odors in wounds or body openings (eyes, ears, nose, mouth). Seek immediate veterinary care for infested dogs.
For up-to-date U.S. case information, see the U.S. Department of Agriculture’s dashboard of Confirmed Detections of New World Screwworm. At present, NWS has only been detected in specific areas of Texas and New Mexico.
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