| The recently emerged strain of the coronavirus called BA.2 that has driven a wave of cases in Europe now accounts for as much as 70 percent of new infections in many parts of the United States, according to an estimate from the genomics company Helix. At 2 p.m., Anthony S. Fauci, director of the National Institute of Allergy and Infectious Diseases, joins Washington Post Live to discuss new variants and the possibility of another wave. | 
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