Temper the celebration: 2-shot Pfizer COVID vaccine appears 90% effective but it’s not known for how long or its impact on severe cases

Credit: The Atlantic

Pfizer and BioNTech’s vaccine is reportedly successful in preventing 90% of infections according to early data from a Phase 3 study.

However it’s … important to stress that the results are preliminary and a successful vaccine is not a given yet. Here are … things to understand:

  • The vaccine requires two doses
  • We don’t know of the vaccine works on severe COVID-19 cases or how long it will be effective.
  • We don’t know if vaccinated people can still carry the disease.
  • If approved, most people will be waiting a while to get the vaccine.
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