Here's a list of disease sites and the search paths required to find them.
D0: Inkpot End
D1: Chillsick Swamp
D1: Leper Fens
D2: Plaguewater Stream
D4: Crown of Darkness
B2: Pool of Unhealthy Rites
The above is shamelessly stolen from a previous vfb thread. Which I will now plug for him here. A great reference for these sort of things. Please thank him if you find it useful.
http://forum.shrapnelgames.com/showt...t=unrest+sites