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.
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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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Vanessa Bryant, WEHI (Walter and Eliza Hall Institute of Medical Research) ; Alex Holmes, The University of Melbourne, and Louis Irving, The University of Melbourne
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.
Fiona Russell, The University of Melbourne and John Hart, Murdoch Children's Research Institute
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)
We want to get everybody vaccinated. Opening up to younger age groups could be one way to speed things up — but it will come with logistical challenges too.
A nurse treats a patient inside a COVID-19 ward of a government run hospital in Kathmandu, Nepal on May 12, 2021.
(AP Photo/Niranjan Shrestha)
The COVID-19 cases are surging in Nepal, potentially surpassing India’s reproduction rate, but the country is out of vaccines. Global aid could help with one of the worst health crises in South Asia.
From free beers to lottery tickets, many jurisdictions around the world have introduced vaccine incentives. Is it time for Australia to do the same?
This giant effigy of the SARS-CoV-2 coronavirus is intended to be burned as part of the Holika Dahan, during which the demon Holika is led to the stake on the eve of the Holi celebrations, a popular Hindu festival.
Sujit Jaiswal/AFP
Paediatrician at the Royal Childrens Hospital and Associate Professor and Clinician Scientist, University of Melbourne and MCRI, Murdoch Children's Research Institute