Food and Drug Administration says drugmakers do not have to conduct large-scale clinical trials for vaccines adapted to fight new coronavirus variants////
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Up to 90 healthy volunteers will be deliberately infected with virus with goal of developing more effective vaccines and treatments
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The three executions were to be the last before President-elect Joe Biden, an opponent of the federal death penalty, is sworn in next week
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The move places sanctions on Cuba and could complicate any efforts by the incoming Biden administration to revive detente with Havana
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