Six more US states find Omicron cases, Delta still top coronavirus threat.

Six more US states confirmed infections of the Omicron variant of Covid-19 on Friday but the Delta strain likely remains a greater threat as winter sets in and Americans gather for the holidays, experts said.

New Jersey, Maryland, Missouri, Nebraska, Pennsylvania and Utah each reported their first cases of the Omicron variant on Friday. Missouri was awaiting CDC confirmation of a case involving a St. Louis resident who had recently travelled within the United States.