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U.S. confirms nation's first travel-associated human screwworm case connected to Central American outbreak

  • In 2025, Maryland confirmed an infection of the New World screwworm parasite in an individual who had recently traveled from Guatemala and received medical treatment within the state.
  • The case arose amid a screwworm outbreak that has been intensifying since late 2023 across regions in southern Mexico and countries to its south, leading to heightened alertness in the United States.
  • US state veterinarians learned of the Maryland case last week during a CDC call, while prevention measures were promptly implemented in the state.
  • In 2025, USDA Secretary Brooke Rollins revealed intentions to establish a facility in Texas dedicated to producing sterile flies as a measure against the pest, which poses a potential economic threat of $1.8 billion to the state's livestock industry if left unchecked.
  • This detection challenges US efforts to keep screwworm eradicated since the 1960s and may impact the cattle industry amid record-high market prices and border controls.
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The female fly lays her eggs on open wounds of animals or humans - The phenomenon can cause serious damage or even death if there is no timely intervention

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Arizona Daily Sun broke the news in on Sunday, August 24, 2025.
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