AdvertisementOmicron could bring the worst surge of COVID yet in the U.S. — and fastDecember 17, 2021Rob SteinfacebookEmailPeople line up outside a free COVID-19 vaccination site on Dec. 3 in Washington, D.C. Many areas are stepping up vaccination and booster shots as more cases of the omicron variant of the coronavirus are detected in the United States. (Samuel Corum/Getty Images)