While it's potentially promising, there's not enough information yet to determine if the vaccine is safe and effective.
A COVID-19 field hospital in Santo Andre, Brazil. The pandemic has killed over 503,000 people in Brazil; just 11% of the population is fully vaccinated.
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The high costs of the world's colossally unequal COVID-19 immunization rates.
The vaccine works by the same principles as the Pfizer and Moderna vaccines, and could be manufactured in Australia.
China has administered more than one billion doses of its homegrown COVID-19 vaccines, the majority of which were developed by local companies Sinovac and Sinopharm. So what do we know about them?
In Australia, a preference for a particular brand of COVID vaccine is likely to change, depending on the latest health advice, and media reports.
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Psychologists have identified three potential barriers to vaccination: capability, opportunity and motivation.
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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?