As BA.2 subvariant of Omicron rises, lab studies point to signs of severity

The BA.2 virus — a subvariant of the Omicron coronavirus variant — isn’t just spreading faster than its distant cousin, it may also cause more severe disease and appears capable of thwarting some of the key weapons we have against Covid-19, new research suggests.The BA.2 virus — a subvariant of the Omicron coronavirus variant — isn’t just spreading faster than its distant cousin, it may also cause more severe disease and appears capable of thwarting some of the key weapons we have against Covid-19, new research suggests.