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Our brains cannot easily understand tiny risks so we tend to overestimate them. That's when we need a little extra help to make the best decisions about our health.
It's OK to wait longer than three weeks between Pfizer doses, and this may even provide stronger protection. But this must be weighed against the risk of contracting COVID in the meantime.
One of this and one of that might be a good strategy to coronavirus vaccination.
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Various companies use different ingredients and different delivery systems in their COVID-19 vaccines. Researchers are investigating whether it's better for individuals to mix what's available.
Even if we came up with a definition of what makes the "best" vaccine, we don't have the luxury of choice, when vaccines are in short supply.
People who contract COVID, and their contacts, have successfully self-isolated at home since the pandemic began.
Infections have been reported in people vaccinated with the Sinopharm vaccine, but these aren't necessarily unexpected.
The level of immunity needed — either through vaccination or infection — for practical herd immunity is uncertain, but may be quite high.
It is unlikely that we will reach full herd immunity for COVID-19. However, we are likely to reach a practical kind of herd immunity through vaccination.
A woman hands out self-test kits at a COVID testing centre in Bolton, England.
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Why it's important to pay attention to evolutionary theory when considering population health.
Though the British prime minister has called on countries to share more doses internationally, the UK may continue to prioritise its domestic rollout.
If you have risk factors around blood clots, heart attack or stroke, this should actually be an impetus to get vaccinated sooner rather than later.
Flat coast, big summit.
After the acrimony of the Trump years, we can expect a very different feel to the latest G7 summit.
Both the AstraZeneca and Pfizer vaccines still work relatively well against it — though only after the second dose.
While we don't know exactly what causes it yet, there are a few leading theories put forward by researchers around the world.
Pharmacist Barbara Violo arranges all the empty vials of the AstraZeneca COVID-19 vaccine that she has provided to customers at an independent pharmacy in Toronto.
THE CANADIAN PRESS/Nathan Denette
Hundreds of thousands of Canadians got a shot of AstraZeneca's COVID-19 vaccine for their first dose. They now have a choice for their second dose: AstraZeneca again, or Pfizer or Moderna mRNA vaccine?
Some people can still get sick after getting vaccinated for COVID-19.
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Vaccinated people can still get infected with the coronavirus. So if you have symptoms of COVID-19, getting tested can protect others and help health officials keep an eye on the virus.
If new incentives don't work, mandatory policies may be the only way forward in ensuring high COVID vaccine coverage of staff.
A healthcare worker holds up a vial of the AstraZeneca vaccine at a COVID-19 vaccination clinic in Montréal, on March 18.
THE CANADIAN PRESS/Paul Chiasson
Answers to key questions about rare blood clots linked to AstraZeneca's COVID-19 vaccine, including risks, symptoms and whether people who have had one AstraZeneca shot should have a second.
One study found antibody levels were significantly higher in people who received one dose of AstraZeneca then a Pfizer booster dose.
Little work has been done to understand young people’s willingness to receive COVID-19 vaccines. Above: a COVID-19 vaccination clinic at the University of Toronto Mississauga campus on May 6.
THE CANADIAN PRESS/ Tijana Martin
As vaccine eligibility is expanded to adolescents and young adults, understanding who might be more likely to be vaccine hesitant, and why, can help inform public health strategies
Navy veteran Faron Smith Jr. reacts as he receives a COVID-19 vaccination at a Veterans Administration pop-up vaccination site on April 17, 2021, in Gardena, Calif.
Patrick T. Fallon/AFP via Getty Images)
As the coronavirus pandemic played out, veterans who were already lacking adequate benefits and resources found themselves in deeper trouble.