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A seemingly endless stream of “subvariants” of omicron, the most recent Greek-letter variant, has emerged in the past few months. How different are these subvariants from one another? Can infection by one subvariant protect someone from infection by another subvariant? And how well are the existing coronavirus vaccines doing against the subvariants? We asked medical and epidemiological experts these and other questions.

United statesSan franciscoNoord hollandDennis cunninghamColin russellWilliam schaffnerBrooke nicholsMonica gandhiCenters for diseaseUniversity of californiaHenry ford health in detroitUniversity of amsterdamWorld health organizationBoston universityVanderbilt universityDisease control