BA.4 and BA.5 causes more severe disease?
Does it depend on natural immunity versus vaccine immunity, versus hybrid immunity?
Meet BA.5, Omicron’s Extremely Contagious Subvariant
The omicron variant of COVID-19 keeps changing, creating newer, more contagious variants. BA.5 seems to be the most contagious version to date and is causing most current COVID-19 cases in the US
BA.5 is causing more reinfection in people who already had COVID-19, including earlier versions of omicron. It’s also evading immunity from the vaccines.