I did the Doctor/ Patient assignment but it cures only their health. When they say they are all done , if i leave them still as patients, as soon as i speed up the timer, here we go again, they insist that they are ready but the sickness sign remains. If i give them other tasks to do they are losing health again. So how exactly can i heal them completely, so that ugly disease sign goes away ?

I used the cheats and went forwards and backwards to look for medicines. Found plague medicine, tetanus and something else. My soldiers have contracted malaria, no malaria medicine though. Maybe i should have them eat moldy bread as a substitute for penicillin.