Unambiguous Science

1/ Protection after two doses The most important decision is to get second dose: stronger + longer lasting protection. Two doses of AZ effective at preventing serious illness from OG Covid-19 + early variants. Early studies show good immune response when Moderna/Pfizer used as second dose. 2/ Protection against new variants Delta variant spreading quickly.

Here’s a visual on the new real-world study assessing effectiveness of AstraZeneca and Pfizer vaccines against the Alpha and Delta variants. This study underscores the importance of being fully vaccinated with two doses, given the rising number of Delta variant cases in Ontario and

There is a lot of pseudoscience being spread on spike proteins made via the vaccines that is being extrapolated out of context from limited data on spike proteins made by the actual SARS-CoV-2 virus. Hope this helps address the

I am often asked what the impact of vaccination in pregnancy or lactation would be specific to passive transfer of antibodies and immunity. Here I try and outline the different types of antibodies, their function and what the subsequent impact would be on the fetus or

3 reasons why you should get vaccinated with the first vaccine offered to

What exactly is vaccine efficacy? Efficacy is a measure of how well a vaccine works in clinical trials – specifically, the percent reduction of disease by comparing two groups – one that receives the vaccine and one that doesn’t, under favourable and tightly controlled settings. However, how one measures efficacy can vary significantly. Within the

Small increased risk of rare types of blood clots accompanied with thrombocytopenia (low platelets). Called ‘vaccine-induced prothrombotic immune thrombocytopenia’ or VIPIT. VIPIT is very rare. Initial estimates from Germany were 4 per million. Subsequent Norwegian estimates are 42 per million. Per Science Table estimates: occurring in anywhere from 1 in every 125,000 to 1 in

A quick snapshot of some of the key differentiators between the four COVID-19 vaccines currently available. Posting with and without

I have been getting a lot of questions on the AstraZeneca Oxford vaccine, and while data is evolving, here is some information Dr Elisabeth Marnik and I put together on its efficacy and safety. So far, it is very effective in preventing severe illness, hospitalization and death – both from clinical trial data as well

I made a stand-alone infographic on Covid-19 vaccines in pregnant and breastfeeding people because of how often this question comes up. It includes guidance from NACI and SOGC, as well as V-Safe Pregnancy Registry information released by CDC