WASHINGTON (Reuters) -The Delta variant is still Americans’ leading coronavirus health threat even as more reports surface of the Omicron strain in the United States on Friday amid concern that winter holidays may further the spread, experts said. While Omicron has been grabbing headlines as the newest coronavirus variant, the predominant U.S. strain remains the Delta variant, said U.S. Centers for Disease Control and Prevention Director Rochelle Walensky at a White House briefing. Scientists are investigating the impact of Omicron, with some questioning whether this coronavirus strain may cau…

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