More than 90% of local infections in Beijing between Nov. 14 and Dec. 20, 2022, were BA.5.2 and BF.7, two existing Omicron sub-variants of COVID-19.
More than 90% of local infections in Beijing between Nov. 14 and Dec. 20, 2022, were BA.5.2 and BF.7, two existing Omicron sub-variants of COVID-19.