A third of US Covid-19 cases now caused by BA.2 Omicron sub-variant, World News
A third of US Covid-19 cases now caused by BA.2 Omicron sub-variant, World News,WASHINGTON – About one-in-three Covid-19 cases in the United States are now caused by the BA.2 Omicron sub-variant of the coronavirus, according to government data on Tuesday (March 22) that also showed overall infection
