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What to know about the New World screwworm fly and its reappearance in the US

Associated Press

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FILE - An adult New World screwworm fly sits in this undated photo. (Denise Bonilla/U.S. Department of Agriculture via AP)
FILE - A test container of dyed fly pupae are displayed at a Domestic New World Screwworm Sterile Fly Production Facility to combat the northward spread of NWS and protect American livestock, in Edinburg, Texas, Feb. 9, 2026. (AP Photo/Eric Gay, File)

U.S. Department of Agriculture

FILE - An adult New World screwworm fly sits in this undated photo. (Denise Bonilla/U.S. Department of Agriculture via AP)