OK, just played again. Seems I missed the explanation in the tooltip the last time. Maybe this is enough.
Since infecting others seems to be the central mechanic in this game mentioning it a second time would not hurt. But I am not sure if you are still allowed to update your game since the deadline of the 7DRL-Challenge is over. Maybe this would be OK since you would only add explanation. But I do not know the rules so well. So better check this before changing your game.
A short explanation on this homepage or just in the comments would also be OK.