What to know about the New World screwworm fly and its reappearance in the US
Summary
The New World screwworm fly, which harms cattle by laying eggs in open wounds, has been found again in Texas for the first time since 1966. Officials are working to control its spread to protect the large U.S. cattle industry, especially in Texas.Key Facts
- The New World screwworm fly’s larvae eat live flesh, unlike most flies that eat dead material.
- Females lay eggs on open wounds of warm-blooded animals, including cattle, pets, wildlife, and occasionally humans.
- The fly was detected in a 3-week-old calf in La Pryor, Texas, about 50 miles from the U.S.-Mexico border.
- The fly had been eradicated from the U.S. by releasing sterile male flies to reduce their population.
- The fly was found in Mexico in late 2024 and has been moving north toward the U.S.
- Texas produces $17 billion worth of cattle, making it an important state for the cattle industry.
- If untreated, infestations can be deadly to animals, but several treatments are approved and available.
- Agriculture officials say the fly does not infect food and expect little impact on beef supply or prices.
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