A vaccine created by Pfizer and partner BioNTech won the race to prove efficacy in a large trial. But is it the best vaccine of the dozens being tested? If it isn’t, will any slower but better vaccines have a chance?
A press release this week claims the vaccine is 90% effective at preventing symptomatic COVID-19. That would mean nearly all of those infections happened in people who got a placebo rather than the vaccine.
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