What To Make Of Pfizer's Big Vaccine Announcement

This week, Pfizer announced that its coronavirus vaccine may be more than 90 percent effective. Anna and FiveThirtyEight's senior science writer, Maggie Koerth, discuss what we know (and don't know) about about the vaccine.

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FiveThirtyEight's COVID-19 podcast is laser-focused on evidence. What do we know about the novel coronavirus, and what do we know we don't know? COVID-19 has pushed Americans into more uncertain territory than most have ever known. Our podcast helps listeners understand what they can be certain about, and what is still unknown. We investigate coronavirus mysteries, debate when it's safe to reopen the economy and keep track of the latest scientific developments on vaccines and treatments. We do it all with FiveThirtyEight's trademark blend of transparency and rigor.