New studies bring BA.2 variant into sharper focus

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(CNN)On the heels of concerning new lab and animal experiments suggesting that BA.2 may be capable of causing more severe disease than the original Omicron strain, two new studies are helping to show how well human immunity is defending against this strain in the real world.

BA.2 is about 30% more transmissible than the original Omicron variant, BA.1, according to early studies from the UK and Denmark, and it is now causing about 1 in 5 Covid-19 cases worldwide, according to the World Health Organization.

Even as Covid-19 cases have been dropping around the world, the relative proportion of cases caused by BA.2 has been increasing. It is outcompeting the original Omicron strain in at least 43 countries, prompting fears of another devastating pandemic wave.

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