Pfizer Vaccine Effectiveness

• Pfizer COVID-19 vaccine effectiveness drops 6 months after 2nd dose: study

  The data suggests that the drop is due to waning efficacy, rather than more contagious variants, researchers said.

  Health

  Oct 4, 2021
  
• Israel reports drop in Pfizer vaccine’s effectiveness in preventing COVID-19 infection

  The decline coincided with the spread of the Delta variant and the end of social distancing restrictions in Israel.

  World

  Jul 5, 2021
  
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• How effective is the 1st COVID-19 jab? What we know as deleted Tory tweet slams ‘one dose summer’

  'One dose, I would say, is going to very likely massively change the epidemiological situation in the country,' said one expert in response to the Conservative's now-deleted tweet.

  Canada

  May 13, 2021
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• Pfizer says South African variant could notably cut down vaccine protection

  The company is making investments and talking to regulators about developing an updated version of their mRNA vaccine or a booster shot, if needed.

  Health

  Feb 17, 2021