Wow, conducting this study (and the IRB review) must have been great. Hm, okay, at first I just saw the very linear response and wasn't sure how that translate

Wow, conducting this study (and the IRB review) must have been great. Hm, okay, at first I just saw the very linear response and wasn't sure how that translates low dose still helps build immunity, but then went back and read your comment up thread, which captures it better: the partial sickness gives partial immunity, thus "priming" the body for the full-blown thing. Though getting the active transmission rate down could be more important in some places.