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…

Right now COVID is running rampant again, and it’s the BA.4 and BA.5 variant, the subvariants of omicron, that is now the dominant strain (BA.5 that is). This is because BA.5.has 3 key mutations in its spike protein that make…