The New World screwworm, a parasitic insect that affects warm-blooded animals, is making a comeback in the United States, with over 70 cases reported since June. Most recently, Arizona reported a case in Cochise County involving a dog with a screwworm-infested wound, confirmed through scientific testing. The Arizona Department of Agriculture and the U.S. Department of Agriculture (USDA) are vigilant in their response.
State Veterinarian Ryan Wolker emphasized swift action, citing ongoing preparations for such events. The screwworm, once almost eliminated from U.S. livestock, is considered a severe pest by the USDA. Its larvae, or maggots, can cause deep wounds by burrowing into the flesh of living animals, but human cases remain unreported in the U.S., with the Centers for Disease Control and Prevention noting the risk to humans as very low.
With the resumption of some cattle imports from Mexico, where screwworm presence was confirmed, monitoring is crucial. Previously halted imports resumed after a screwworm case was reported there in November 2024. USDA has confirmed most cases in Texas and New Mexico and recently reported the first wildlife case, maintaining vigilance in U.S. agricultural practices.
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