Inside the Lab With Pfizer's 'Variant Hunters'

Inside the Lab With Pfizer's 'Variant Hunters'
(AP Photo/Stew Milne)

Delta was tearing its way through India and, as the death toll climbed higher, so did the anxiety inside Pfizer’s lab north of New York City. The Covid-19 variant was threatening to undo their work from the past breakneck year, by rendering their acclaimed vaccine ineffective.

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