BA.4

 A more contagious subvariant of the COVID-19 Omicron strain has slipped into Russia, a senior official at the national consumer health watchdog Rospotrebnadzor said. Kamil Khafizov, the head of genome research at Rospotrebnadzor’s Central Research Institute for Epidemiology, told reporters that two national labs had submitted the viral genome of the BA.4 sublineage […]