When the U.S. CDC announced the resurgence of New World Screwworm (NWS) in the Americas in October 2024, the flies that produce larvae that feed on living tissue were still thousands of miles away from the United States border.
However, the situation has rapidly changed in 2025, with the the CDC and the USDA confirming the detection of NWS in northern Mexico.
NWS is a significant threat to Texas, the largest cattle-producing state.
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