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Two Omicron Subvariants Drive Summer Infections

Two Omicron Subvariants Drive Summer Infections

July 3, 2022 — Two Omicron subvariants — BA.4 and BA.5 — are propelling the growth of COVID-19 infections this summer as they become the dominant coronavirus strains in the U.S. These variants now make up 52.3% of infections, with BA.5 accounting for 36.6% of new cases and BA.4 accounting for 15.7% …

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