It wasn’t that long ago that many Americans rejoiced at the news that several vaccines against the SARS-CoV-2 virus had been developed and approved for use on an emergency basis. And while there are data showing that the vaccines do, in fact, do a good (if imperfect) job at protecting the inoculated, it now appears that at least one of them wanes 6 months after administration. A preprint report of a study published online by …
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