As part of a dev diary released over on the Paradox forums early today, Paradox Interactive announced some interesting new mechanics for Crusader Kings II.
In the post the studio announced that a new set of features will be added in the, upcoming but as-yet unnamed DLC. Paradox stated they will be adding symptoms, diseases, and doctors (court physicians) into the game.
These operate as you might expect, a character becomes ill and shows signs of various symptoms which can either simply go away or could turn into a full blown disease. A doctor or 'court physician' is a title you can give a well-learned person, this makes them responsible for diagnosing and treating illnesses among your characters.
A full rundown of the these features is given in this forum post along with an in-depth example of the systems.
Sounds like the next expansion for the dynastic sandbox simulator is going to have a fatal edge to it, and we can't wait to find out more.