COVID Vaccine Efficacy

• Delta variant weakens protection from Pfizer, AstraZeneca COVID-19 vaccines: study

  Those who get infected after two shots of the Pfizer-BioNTech or AstraZeneca vaccine may be of greater risk to others than under previous variants of COVID-19, U.K. study shows

  Health

  Aug 18, 2021
  
• COVID-19 vaccine protection likely to dim over time: U.K. advisers

  Scientists said it might be expected that COVID-19 vaccine effectiveness would remain high for severe disease but effectiveness against mild disease could fall off over time.

  Health

  Jul 30, 2021
  
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• Canada facing the start of a Delta-driven 4th wave, top doctors warn

  The news comes on the heels of an upward trend in cases across Canada which, if vaccine uptake doesn't increase, could eventually exceed healthcare system capacity.

  Canada

  Jul 30, 2021