.gif)
A lot has been written recently about the merits of different potential vaccines for SARS-CoV-2. "Merit" is generally assumed to mean that the vaccine will make us immune. But what, exactly, is immunity, and how would we attempt to measure it once attained? The short answer is that we don't really measure immunity. The longer answer is that sometimes we do at least have some clues.
source:https://medicalxpress.com/news/2020-12-successful-sars-cov-vaccine.html