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Omicron variant now accounts for 73 percent of new infections last week in the United States

South africaUnited statesMichael osterholmUniversity of minnesotaInfectious disease researchRepresentational imageOmicron variantCovid united statesOmicron united statesOmicron cases rising in united statesOmicron dominant strain in united statesCovid cases rising in usOmicron variant vaccine effectiveness