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

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

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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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