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Omicron sub-variant now up to 23.1% of COVID variants in U.S. - CDC

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Initial data for the BA.2 sub-variant, which has begun to replace Omicron's more common BA.1 variant, shows no significant difference in disease severity, the World Health Organization said last month.

Other Omicron sub-variants that have been circulating since December, called BA.1.1 and B.1.1.529, now make up for around 66.1% and 10.8% of circulating variants, respectively. ..

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