Omicron BA.4 and BA.5 strains are the dominant strains in the United States, accounting for more than 70% of cases.
On July 5, local time, the Centers for Disease Control and Prevention said that as of July 2, the rapidly spreading Omicron variant strains BA.4 and BA.5 have become the dominant strains in the United States, causing a combined 70.1% of new coronary pneumonia infections. The new data also show that the share of BA.4...
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