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U.S. Confirms First Travel-Linked Human Case of New World Screwworm in Maryland

Officials describe very low public-health risk, with efforts focused on protecting livestock.

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Overview

  • Health and Human Services said the CDC and Maryland health officials confirmed the parasite on Aug. 4 in a patient who had returned from El Salvador, and reported no U.S. animal cases this year.
  • Industry communications described the traveler as coming from Guatemala, creating a reporting discrepancy that federal officials have not resolved publicly.
  • USDA is expanding the sterile-fly program, including a planned facility at TexasMoore Air Base, to counter a capacity gap as the Panama plant produces about 100 million flies weekly versus an estimated 500 million needed.
  • The U.S. has tightened controls on live-animal imports from Mexico and boosted surveillance, while Mexico is building a $51 million sterile-fly plant after cases reached Veracruz roughly 370 miles from the Texas border.
  • HHS authorized FDA emergency use of animal drugs for screwworm, and USDA estimates a Texas outbreak could cost about $1.8 billion, heightening market sensitivity in an already tight cattle sector.