Pfizer’s announcement Monday that its vaccine for Covid-19 was 90% effective in late-stage trials is the best news of a dismal 2020. If the interim results hold, this could lead to a mid-2021 pandemic exit—and perhaps spare us from the lockdown instincts of the coronavirus team that Joe Biden announced Monday.
The 90% rate is far above most expectations. The Food and Drug Administration has set a 50% effectiveness rate for considering expedited approval, and Europe has said it may approve a vaccine that is less than 50% effective….
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