With three vaccines now approved and news that the U.S. will have enough shots for every adult by the end of May, it feels like the country is turning a corner. But, even after getting vaccinated, Americans still have to mask and distance. Why is that? Can you still spread it? And with lots of efficacy numbers out there, is one vaccine ‘better’ than another?

James Hamblin and Maeve Higgins ask virologist Angela Rasmussen.

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