Omicron accounts for 73% of new US Covid cases

Katie Lucey administers a Covid-19 test on her son Maguire on Wall Street in New York (AP Photo/Ted Shaffrey)

Omicron accounted for 73% of new infections last week and is now the dominant version of the coronavirus in the US, federal health officials said.

The Centres for Disease Control and Prevention (CDC) numbers showed nearly a six-fold increase in Omicron’s share of infections in only one week.