The BA.2 sub-variant of Omicron makes up over a third of all coronavirus variants circulating in the United States, according to an estimate from the US Centers for Disease Control and Prevention (CDC) on Tuesday.
Covid-19 infections in the United States have receded sharply since hitting record levels in January, although a coronavirus resurgence in parts of Asia and Europe due to the BA.2 sub-variant has raised some concerns.
As of March 20, the seven-day moving average of US Covid-19 cases was 27,786, down 17.6% from a week earlier.
Most of the United States is considered to have low transmission, under new CDC
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