NEW: The U.S.'s pace of vaccinations has sped up. We're at nearly 1.5 million a day. But if we want to get "back to normal" by the end of the summer, we have to go way faster. http://wapo.st/vaccination-pace-herd-immunity
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Why do these public health experts speak with such urgency? They're worried about emerging mutations which, in time, could learn to resist current vaccines. Faster vaccinating gets us to herd immunity before such "escape variants" can emerge. http://wapo.st/vaccination-pace-herd-immunity 🧵 4/5
This story features an interactive calculator that lets you explore these concepts for yourself! Give it a try here: http://wapo.st/vaccination-pace-herd-immunity 🧵 5/5
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