Observational studies show excellent efficacy of two-dose regimen of Pfizer or AZ against the Delta variant dramatically reducing the risk of hospitalization. #vaccineswork

Dr. Barry Dworkin

Medical Mythbusting Commentary for June 15, 2021

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Source:
2 Pfizer COVID-19 vaccines more effective than AstraZeneca against Delta variant, data says

Reference:
SARS-CoV-2 Delta VOC in Scotland: demographics, risk of hospital admission, and vaccine effectiveness
Effectiveness of COVID-19 vaccines against hospital admission with the Delta (B.1.617.2) Variant

Related posts:

  1. Short-lived common side effects including fever, chills, pain, and headache after mixing AZ with Pfizer vaccine reported in @TheLancet. Immunogenicity results to be reported in June and if mixing is a viable option (likely but assumption needs evidence).
  2. Risk calculus and interpretation changing in Ontario. Public Health recommends suspending first dose of AZ vaccine pending further data analysis. Outcome even if in favour of resumption will not change the erosion of public confidence.
  3. NACI recommends second dose Pfizer/moderna vaccine for those who had AZ as their first dose.
  4. Ontario to expand eligibility of COVID-19 boosters for adults 50 and older finally recognizing that this is a three-dose vaccine. #VaccinesWork