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Omicron accounts for 73% of new COVID-19 cases in U.S. Omicron accounted for 73% of new infections last week and is currently the dominant version of the coronavirus in the United States. This figure is much higher in most countries. Omicron is responsible for more than 90% of new infections in New York City, the Southeast, Industrial Midwest, and Pacific Northwest regions. There were more than 650,000 omicron infections across the United States last week.Early studies suggest that the fully vaccinated will need a Omicron Booster Dose for the best chance at preventing Omicron infection.