World rushes to boost against Omicron, but questions remain

In the days after earliest findings showed that omicron caused a 25 to 40-fold loss of neutralizing antibodies from the Pfizer Inc.-BioNTech SE vaccine, the second-most used shot across the world, the U.S. expanded booster access to teenagers while countries like the U.K. and South Korea are slashing wait times for a third dose in half, to three months.

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