We've finally had some amazing (and badly needed) news about COVID. Vaccines from Pfizer and Moderna are about 95 percent protective against COVID. But perhaps more importantly, according to interim analyses, Moderna's vaccine is 100% protective against severe COVID. This number is not only more impressive but may also be more clinically relevant.
Pfizer and Moderna are producing fewer but more effective (and pricier) vaccines, while AstraZeneca is making a greater number of less effective (and cheaper) vaccines.
We've just gotten a whole bunch of good news – news we really needed – about finally getting the upper hand against COVID-19. Two vaccines, both more than 90% effective at protecting clinical trial participants against the disease, were announced just seven days apart. These numbers are well beyond expectations, but some critically important questions linger. Here they are. The answers will determine how successful the vaccines will be.