The New World screwworm, a flesh-eating fly that wiped out hundreds of thousands of cattle in the past, has returned to the U.S. after 60 years — confirmed in a Texas calf. Officials are deploying the same sterilization tactic that worked on Curaçao: releasing millions of sterile male flies to crash the population. Operations are underway in Texas and along the border, with new facilities in the works. While not a food threat, the pest can infect humans — over 2,000 cases reported in Mexico and Central America. Experts are confident they’ll contain it, but warn a single female can lay thousands of eggs, making vigilance critical.

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