“Omicron surfaced last Thanksgiving and spread like wildfire. Since then, multiple Omicron subvariants have emerged. In early July 2022, a strain called BA.5—the most contagious one so far along with BA.4, another subvariant—is causing more than 50% of cases, making it the predominant strain in the United States. (BA.4 accounts for about 20% of all U.S. COVID cases.)” CDC
which omicron variant did SPL do?
“Omicron surfaced last Thanksgiving and spread like wildfire....
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