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Articles on COVID-19 vaccines and variants

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Luis Ascui/AAP

What’s the ‘Indian’ variant responsible for Victoria’s outbreak and how effective are vaccines against it?

The COVID-19 variant responsible for Victoria's latest outbreak is one of three Indian variant sub-types, which spreads more easily than the original strain. Here's what we know so far.
Colorized scanning electron micrograph of a cell (orange) infected with UK B.1.1.7 variant SARS-CoV-2 virus particles (green), isolated from a patient sample. Image captured at the NIAID Integrated Research Facility (IRF) in Fort Detrick, Maryland. (NIAID)

COVID-19 variants FAQ: How did the U.K., South Africa and Brazil variants emerge? Are they more contagious? How does a virus mutate? Could there be a super-variant that evades vaccines?

Variants of the original SARS-CoV-2 are now in wide circulation. That means the third wave of COVID-19 has come with new questions about the variants, their effects and what might come next.
The AstraZeneca vaccine was 70 per cent effective against symptomatic COVID-19 infection in a large multinational study, and recently reported 76 per cent overall efficacy against symptomatic COVID-19 in another large study done primarily in the United States. THE CANADIAN PRESS/John Woods

AstraZeneca COVID-19 vaccine FAQ: Why do the age recommendations keep changing? Does it cause VIPIT blood clots? Is it effective against variants?

With changing recommendations about AstraZeneca's COVID-19 vaccine making headlines, many people have questions about its use.
A COVID-19 patient in an ICU unit in a hospital in Capetown, South Africa, in December 2020. A variant emerged in South Africa that has since spread to other parts of the world. Other new variants could emerge elsewhere. Rodger Bosch/AFP via Getty Images

How worried should you be about coronavirus variants? A virologist explains his concerns

As the US vaccinates millions more people each day, the novel coronavirus works to survive. It does this by mutating. So far, several variants are worrisome. A virologist explains what they are.

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