Yeah, so you're asking, if for example, why do you need a booster of tetanus, because if I get exposed to tetanus wouldn't I have this rapid response?

所以你会问,举个例子来说,已经感染过破伤风杆菌的人,为什么仍然需要接种破伤风疫苗,身体不是应该马上对该病菌做出应答吗

耶鲁公开课 - 生物医学工程探索课程节选

The answer is "Yes you would", the question is "Would that response, even though it's much faster, be fast enough to protect you from the initial exposure to tetanus that you got?"

是的,你的身体会马上做出应答,问题是 即便免疫应答十分迅速,但是否足够迅速,以保护你不被破伤风杆菌感染

耶鲁公开课 - 生物医学工程探索课程节选