BA.5 causes concern because of its increased contagiousness and because of its greater ability to evade the protection from vaccines and prior infection.
The current wave of the omicron variant of the coronavirus making its way across the U.S. — dominated by the subvariants BA.4 and BA.5 — is sparking new concerns about a seemingly endless cycle of Covid infections.
The coronavirus subvariant known as BA.5 accounted for nearly 54% of the country's Covid cases as of Saturday, according to the Centers for Disease Control and Prevention. A similar subvariant, BA.4, makes up 17% more.
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