[thejeff]

Well, I think that was the original intent of the Fever
Fetish.
It doesn't really make sense that undead can get diseases, but have no ill effects from them and still generate gems with Fever Fetish.

I do like the idea of items of dead commanders in lab provinces going back the lab. Probably not if they died in battle and maybe not if they're killed by range spells (Flames/Fire from the Sky, Seeking arrows etc), but someone dying of disease should be able to prepare a little bit.