Health Canada is informing Canadians and healthcare professionals about changes to the product labels of the Janssen and Vaxzevria (AstraZeneca) COVID-19 vaccines.The Department is updating the label of the Janssen COVID-19 Vaccine to provide additional information about the very rare risk of immune thrombocytopenia (ITP), an autoimmune condition, and the rare risk of venous thromboembolism...
Tag: cover-19 vaccine
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Real World Evidence for COVID-19 Vaccines
Similar to clinical trials, real world cohort and case-control studies find COVID-19 infections are reduced by >90% with two doses of mRNA vaccines. Single doses of either mRNA or AstraZeneca vaccine decreases infections by ~60% and hospitalizations by 70-80%. Vaccine effectiveness appears similar for variants of concern and are safe for pregnant women. HMC
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3 Approved COVID-19 Vaccines Efficacy
Interim results of two large randomized, placebo-controlled trials (RCTs) demonstrate ~95% relative efficacy in preventing COVID-19 (Pfizer, Moderna). The AstraZeneca/Oxford vaccine has ~70% relative efficacy. Absolute benefits will vary with baseline risk and time but if annual risk of developing COVID-19 is 20%, then vaccine would decrease risk to 1% (6% with AstraZeneca/Oxford). These vaccines...