I agree the icon sucks. I got infected tonight from cold, had to spend hours hunting and raiding hospitals (finally found antibiotics, BOOYAH!). Now its day (which I think was 42c) and I really don't see much difference in the icon. And I've never seen it flash. Not tonight even. If someone could post some pics to show when its too cold, I would appreciate it. Also if anyone can explain the logistics of being by a fire (how close, how long) I would really appreciate that too.