A cohort study means you take the same group of people and follow them every five years for that period of time.
定群研究意味着你只有一组研究对象,然后在研究期间每五年进行一次记录数据
That's why every-- development of every specific vaccine turns out to be different because they don't all follow exactly this kind of time course.
这就是为什么,每一种疫苗的发展都是不同的,因为疫苗诱导产生应答所需时间各不相同
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