4 min read.Updated: 02 Aug 2021, 11:43 AM ISTWilliam Petri, PTI
A vaccine booster is the injection of an additional dose, intended to maintain immune protection against a given pathogen.
RICHMOND : The increasing prevalence of new variants of the coronavirus raises more and more questions about the level of protection even after vaccination: won't these changes in the SARS-CoV-2 virus escape the immunity obtained?
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