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Why are there so many Covid variants of concern in circulation?

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By Sebastian Duchene, The University of Melbourne and Ash Porter, The Peter Doherty Institute for Infection and Immunity By now, many of us will be familiar with the Omicron variant of SARS-CoV-2, the virus that causes Covid.

This variant of concern has changed the course of the pandemic, leading to a dramatic rise in cases around the world. We are also increasingly hearing about new Omicron sub-variants with names such as BA.2, BA.4 and now BA.5.

The concern is these sub-variants may lead to people becoming reinfected, leading to another rise in cases. Why are we seeing more of these new sub-variants?

Is the virus mutating faster? And what are the implications for the future of Covid? We need your consent to load this rte-player contentWe use rte-player to manage extra content that can set cookies on your device and collect data about your activity.

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