Does disease spread to other units in province?

[DeadlyShoe]

There are a few units with the special ability Plague Carrier (denoted by an icon that looks like a bearded face or something) and they have a chance of causing other units in the province to become diseased. These units are very rare, namely only the Apparition and the Eater of the Dead are ones I can remember offhand.

+ The Man with the Iron Crutch.

I looked thru the strat guide and manual, but couldn't find any "spread" info beyond the sieging spread into the castle due to starvation.

Any starving unit can get diseased, not just ones in castles.