Ontario government is extending the vaccination dose interval up to 16 weeks for the three two-dose vaccines currently approved by Health Canada (Pfizer-BioNTech, Moderna and AstraZeneca/COVISHIELD). This is based on the recommendation of the National Advisory Committee on Immunization (NACI). Individuals who have already booked their second dose will have their appointments rescheduled. This will...
Tag: efficacy
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COVID-19 Vaccines
Dear community members and families, In the last few weeks, we have seen significant movement in our understanding of the COVID-19 vaccines. As of today, here is what we know: The vaccines are safe The vaccines approved for use in Canada work by sending a message to our body’s immune system to stimulate our natural immune response....
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Answering Patient Questions about COVID-19 Vaccines
Dear Patients, As you all know, the first vaccines are being given to higher-risk people and healthcare workers. But we look forward to when you all will have access to the vaccine. We do not yet know the place or the timing and we will communicate this when we do. Appropriate steps taken – The...
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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...