Mind you, that three weeks in cata are much longer than three weeks in real life. I think the default season length is 14 days, so you’d get sick around 3 to 4 times per year…, which is still much, I guess.
I didn’t know that the health stat is actually not that useful, people always kept praising vitamins to no end.
On the other hand, it is also not good to increase the importance of the health stat too much, imho. Mostly because there are specific “treatments”, like the flu shot, which just increase health in general instead, therefore leading to strange results.
Ideally, we need another stat “hygiene” (as discussed in another thread), which would also interact with those things.
Also, chances of catching the flu should be somewhat lower than today, considering that human-to-human infection is impossible after the cataclysm.