The United States, Britain, France, Australia and other countries are shattering records for daily reported coronavirus cases as the highly transmissible omicron upended hopes of a return to some version of normality in parts of the world.The “overall risk related to the new variant … remains very high,” the World Health Organization said in its weekly epidemiological report Tuesday, citing “consistent evidence” that omicron has a growth advantage over the delta variant, which remains dominant in parts of the world.It came as the U.S. hit a record 7-day case average of 262,034 cases on Tuesday, eclipsing a past 252,776-case record set on Jan. 11, according to an NBC News data analysis. (The data can be skewed by days with anomalous data entries, which are common around the holiday period.)In all, 1.8 million cases were reported in the U.S. last week, however, representing a 69.3 percent increase compared to the week before.According to the Centers for Disease Control and Prevention, omicron accounted for 58.6 percent of all Covid cases in the U.S. in the week ending on Dec. 25, while the delta variant accounted for 41.1 percent of cases. A line outside a Covid testing site in Farragut Square, Washington, on


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