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Articles on Vaccine dose

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Broad protection from a universal flu vaccine could replace seasonal flu shots. Flavio Coelho/Moment via Getty Images

How do you make a universal flu vaccine? A microbiologist explains the challenges, and how mRNA could offer a promising solution

Annual flu vaccines are in a constant race against a rapidly mutating virus that may one day cause the next pandemic. A one-time vaccine protecting against all variants could give humanity a leg up.
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.
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.
Health-care workers wait in line at a COVID-19 vaccine clinic in Toronto on Jan. 7, 2021. THE CANADIAN PRESS/Nathan Denette

COVID-19 vaccine rollout: Why a mask and social distancing are still needed, even if you get the shot

Rollout of COVID-19 vaccines has begun. But getting the jab doesn’t mean abandoning masks, distancing and handwashing. Here’s why the current preventive measures must continue post-vaccine.

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