For now, BA.2.75.2 is extremely rare, making up just 0.05% of the coronaviruses that have been sequenced worldwide in the past three months. But that was once true of other omicron subvariants that later came to dominate the world. If BA.2.75.2 becomes widespread this winter, it may blunt the effectiveness of the newly authorized boosters from Moderna and Pfizer.
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