Just published @nature
Soon (10-12 days) after 1st dose of an mRNA vaccine, fully functional CD8+ T cells kick in to provide some protection, well before neutralizing antibodies are barely detectablehttps://www.nature.com/articles/s41586-021-03841-4 …
Single dose for previously infected people is shown to be superior protection to infection alone, but also they don't need a booster.
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