The sharp rise in COVID-19 cases attributed to the Omicron variant so close after the winter holidays is a nonscientific (but probably accurate) indicator that people spent a lot of time in tight quarters, unmasked, with others whose immunization or exposure status was unknown to them. The more ominous prospect, given that many individuals got rapid tests (or insisted that visitors do so) before gathering, is that rapid antigen tests may not be much help …
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