Daily Mail: Rampant Omicron becomes U.S.'s dominant strain: 377,014 Americans are diagnosed with COVID in 24 HOURS - one day after a record 512,553 caught the virus * CDC made shock revision of Omicron prevalence, cutting the number of cases involving the new strain by half * Omicron accounted for 23% of all cases in the week ending December 18, as opposed to 73% initially reported * The Omicron variant accounted for 59% of all new cases for the week ending on December 25, CDC says * It means that Delta has been accounting for far more infections than the agency initially thought * Still, data from England warns that Omicron will soon take over, as the variant is now 92% of all cases there * On Tuesday the US broke its record for daily COVID-19 cases, with a seven-day average of 264,546 cases * The country's previous record was about 247,503 daily cases, reported on January 11, 2021 * On Tuesday, the US recorded 377,014 new cases and 2,377 deaths in 24 hours