Talk:Rats/@comment-213.205.228.44-20130308212643/@comment-75.37.2.113-20130905085614

It's possible Corvo is immune, either from his gear (which is specifically designed to counteract the spread of the plague) or from heredity since we know it hit Serkonos well in the past. Which tends to kill off huge gobs of the population but allow those that survive to build up a tolerance for it.

The fact that he is not exposed to the elements and gets good treatment also help. Campbell was basically exiled from the entire human race when he got the brand, and definitely wouldn't have been in great shape or in a good place because of that.