The National Institute of Health (NIH) Islamabad and Aga Khan University (AKU) have confirmed the presence of XBB, sub-variant of Omicron variant and one of three dominant strains of Covid-19 in China, in the country through genome sequencing. According to the reports, Sindh Health Department on Tuesday confirmed the presence of XBB and XBB-1 sub-variants of the Omicron […]