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Not really a booster. it turns out this was always a two-dose vaccine. something that weve talked about all year. you know, when we looked at the early phase one, phase-two trial data, it really needed two doses to get consistently high levels of virus neutralizing antibody for everyone. and at that point it was a really, really good vaccine. so there is a subtle difference. with the pfizer vaccine, for instance, theres clear waning, munts, and you need a booster to restore the immunity. with th...