Two new Omicron variants are spreading. Will they drive a new U.S. surge?

Two new Omicron variants are spreading. Will they drive a new U.S. surge?

New versions of Omicron are again causing a surge of COVID-19 cases in South Africa, and studies show that these new subvariants are so different from the original version of Omicron that immunity generated from a previous infection may not provide much protection. Dubbed BA.4 and BA.5, the new subvariants are nearly identical to each …

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