TEXAS — Dog owners now have another treatment option if their pet becomes infected with New World screwworm.
The U.S. Food and Drug Administration announced Thursday that Simparica TRIO can be prescribed by veterinarians to treat screwworm infestations in dogs and puppies under an Emergency Use Authorization.
The authorization is for treatment only. The medication is not authorized to prevent screwworm infestations.
New World screwworm is a parasite caused by fly larvae that enter wounds or other openings and feed on living tissue. Without treatment, an infestation can cause serious injury and may be fatal.
The FDA said most dogs in the United States remain at low risk. However, the parasite has been detected in parts of Texas and New Mexico.
Owners should keep a close eye on dogs that live in, visit or return from affected areas. Signs of an infestation can include visible maggots or a foul odor coming from a wound or around the eyes, ears, nose or mouth.
Anyone who suspects their dog may be infected should contact a veterinarian immediately.
Simparica TRIO is already approved for several other uses, including heartworm prevention and the treatment and control of fleas, ticks, roundworms and hookworms. Thursday’s action allows it to be used for screwworm treatment while the federal emergency authorization remains in effect.
The FDA said available evidence shows the medication may be effective against screwworm and that its possible benefits outweigh the known and potential risks when used as directed.
The drug will remain available by prescription only. One of its ingredients has been linked in some animals to neurological reactions, including tremors, loss of coordination and seizures. Pet owners should speak with their veterinarian before giving the medication to their dog.
Texas Agriculture Commissioner Sid Miller welcomed the decision, saying it provides another option for protecting family pets and the working dogs used by farmers and ranchers. He added that treatment alone will not eliminate the threat and called for continued efforts to eradicate the parasite.
More information is available through the FDA’s official announcement.
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