×

Zoetis gets US FDA emergency use nod for treatment for screwworm in dogs

By Thomson Reuters Aug 13, 2026 | 1:41 PM

Aug 13 (Reuters) – The U.S. Food and Drug Administration on Thursday issued an emergency use authorization for Zoetis’ flea and tick drug ​to treat New World screwworm (NWS) infestations in ‌dogs and puppies.

Here are more details:

• Currently, most dogs in the U.S. are at low risk of exposure to NWS, which is a flesh-eating livestock pest, due to their ‌geographic ​location, the FDA said.

• However, ⁠dogs that live in, ⁠travel to, or return from areas where screwworm infestations have been identified by 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, foul ⁠odors in wounds or body ⁠openings, the agency said.

• At present, ​NWS has only been detected in specific areas of ​Texas and New Mexico.

• The FDA issues ‌emergency use authorizations to allow the use of unapproved treatments during public health threats when no alternatives are available.

• Based on the totality of data ⁠available, the FDA said it is reasonable to believe that Simparica TRIO may be effective in the treatment of ⁠NWS infestations.

• ‌The drug was approved by the ⁠FDA in 2020 for heartworm, flea ​and ‌tick-related indications in dogs and puppies. ​It is ⁠available only by prescription.

• Elanco Animal Health also received an emergency use nod for its drug, Credelio, last year to treat dogs infected with New World screwworm.

(Reporting by Sneha S K in Bengaluru; Editing by ​Shreya Biswas)