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Articles on Vaccine efficacy

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People getting vaccinated may still have questions about COVID-19 vaccines, like why it takes two doses — and then two weeks — to take full effect. THE CANADIAN PRESS/Ryan Remiorz

I work at a COVID-19 vaccine clinic. Here’s what people ask me when they’re getting their shot — and what I tell them

A medical student answers questions he gets asked at a COVID-19 vaccine clinic: Efficacy versus real-world effectiveness, immune response and how the mRNA vaccines compare to vaccines already in wide use.
Vaccine efficacy statistics are often based on the results of randomized controlled trials. (Art-Aleatoire.com)

How effective are COVID-19 vaccines? Here’s what the stats mean … and what they don’t

Vaccine efficacy is usually expressed as a percentage, but what is it actually measuring? Statisticians explain what the numbers mean, and what they say about how well a vaccine can protect us.
Make that second appointment and get your final dose for full protection. MediaNews Group/Reading Eagle via Getty Images

How effective is the first shot of the Pfizer or Moderna vaccine?

An immunologist explains that you get some protection from the first dose of the mRNA vaccines but you need two to build up strong immunity, particularly to newer coronavirus variants.
A COVID-19 vaccine is administered at a clinic at Olympic Stadium in Montréal on March 1, 2021, marking the beginning of mass vaccination in the Province of Québec based on age. THE CANADIAN PRESS/Paul Chiasson

COVID-19 vaccine FAQs: Efficacy, immunity to illness vs. infection (yes, they’re different), new variants and the likelihood of eradication

With four COVID-19 vaccines approved for use in Canada, it’s time to answer FAQs about efficacy, immunity, eradication and variants.
Israel has the highest rate of COVID-19 vaccine coverage worldwide, and so has been one of the first countries to report on vaccine effectiveness. Abir Sultan/EPA-EFE

COVID vaccines: how to make sense of reports on their effectiveness

Real-world studies of vaccines aren’t directly comparable with clinical trials, but their results are still good news.
Tamara Dus, director of University Health Network Safety Services, administers a Pfizer-BioNTech COVID-19 vaccine in Toronto. THE CANADIAN PRESS/Frank Gunn

5 factors that could dictate the success or failure of the COVID-19 vaccine rollout

The arrival of COVID-19 vaccines has raised hope for an end to the pandemic. Hopefully that’s true, but there are variables. Here are some factors that could affect the success of the vaccine rollout.

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