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New World Screwworm Confirmed in Arizona Dog, USDA Says

  • On Wednesday, the U.S. Department of Agriculture confirmed Arizona's first New World screwworm case in a dog in Cochise County, marking the parasite's spread into a third U.S. state.
  • Since June, 71 cases have been reported across the United States, with 18 currently active; the parasitic fly advanced north from South America through Texas and New Mexico before reaching Arizona.
  • Federal and state officials are responding by establishing a 20-kilometer infested zone around the detection site, while the Arizona Department of Agriculture and USDA increase surveillance and release sterile flies to suppress the population.
  • State Veterinarian Dr. Ryan Wolker said, "We have been preparing for this possibility for a long while and are acting swiftly," as officials urge pet owners to check animals daily for wounds or maggots.
  • Plans for a Sterile Fly Dispersal Facility in Douglas, Arizona, continue to move forward as the USDA recently resumed livestock imports from Mexico at three ports of entry in Arizona and New Mexico.
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El Paso County joins areas with confirmed cases of the parasite, whose larvae invade wounds

WBALWBAL
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Arizona reports 1st animal case of New World screwworm after canine found to be infected

Cochliomyia hominivorax, the New World screwworm fly, is a species of parasitic fly that is well known for the way in which its larvae (maggots) eat the living tissue. (Ramdan Fatoni/Getty Images) Arizona officials confirmed the state’s

·Baltimore, United States
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AZCentral broke the news in Phoenix, United States on Wednesday, October 28, 2026.
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