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.

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