The U.S. government paid scientists to figure out how the deadly bird flu virus might mutate to become a bigger threat to people – and two labs succeeded in creating new strains that are easier to spread.
On Tuesday, federal officials took the unprecedented step of asking those scientists not to publicize all the details of how they did it. [They worried] that this research with lots of potential to help the public might also be hijacked by would-be bioterrorists.
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