The COVID-19 Omicron variant accounted for approximately 95.4 percent of U.S. COVID-19 cases diagnosed in the week ended Jan. 1, said the Centers for Disease Control and Prevention (CDC) in an update published Tuesday. With the CDC’s finding, it suggests Omicron is highly contagious, as it was able to displace the previously dominant Delta strain in only a few weeks. The Delta variant now accounts for about 4.6 percent of all cases, the CDC figures show. About two weeks ago, the CDC reported that Omicron only accounted for about 38 percent of all COVID-19 cases for the week ending on Dec. 18. The agency significantly revised its estimates for Omicron’s prevalence for the week ending on Dec. 25 from 73 percent to about 58 percent. The United States, meanwhile, set a global record of almost 1 million new coronavirus infections reported on Monday, according to a tally, nearly double the country’s peak of …