Racing to Update the Vaccines For Variants

Just two months ago, the incredible performance of new vaccines from Moderna and Pfizer had people cheering for an imminent end to the pandemic. But an onslaught of fast-spreading and potentially dangerous mutations of the virus changed that. So now, even as pharma companies ramp up production in the early stages of a massive rollout, they are racing to retool their vaccine strategies. Robert Langreth reports that booster shots could give drugmakers a lucrative new revenue stream. 

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