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The Guardian - US
The Guardian - US
World
Gloria Oladipo

Concern grows as two new Omicron sub-variants spread across US

United States Omicron CDC
Person fills syringe with Moderna vaccine
Two new subtypes of Omicron have spread particularly in the south. Photograph: Frederic J Brown/AFP/Getty Images

Two new sub-variants of Omicron are spreading throughout the US, leaving experts concerned about their transmissibility amid America’s ongoing Covid-19 pandemic.

According to new data from the Centers for Disease Control and Prevention (CDC) published on Tuesday, sub-variants BA.4 and BA.5 now account for almost 13% of all new Covid-19 cases in the US between 29 May and 4 June, making up 5.4% and 7.6% of cases, respectively.

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