The Omicron variant of COVID-19 was only named on Friday, but it's already notorious.

Even though there are still more questions about it than answers, the new variant is already wreaking havoc worldwide, as governments pre-emptively throw up borders and reintroduce restrictions in a bid to slow its spread.

So what do we know about Omicron for sure?

And among the known unknowns, what is the greatest cause for concern?

Today on The Signal: Omicron, the latest twist in the pandemic.

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Professor Nancy Baxter, Head of Melbourne School of Population and Global Health, University of Melbourne