Two questions

[HJ]

1) I just noticed that my 100% poison resistant serpent priest/prophet got diseased. He was never hit by a spell or a physical attack, of that I'm sure. He always remained in the far back casting blessing and fanaticism, and his army was never starving. C'tis is not in the game, so Miasma is not an option. The only hostile dominion he was under was the one from Marignon, and I don't think they have a diseasing dominion. I've searched all the provinces he's visited recently with Dark Knowledge, and none of them contains any infectuous sites. However, some of his hydras also have a disease. Now, my main question is, how did that happen? Are the sites that give disease death sites or unholy sites? If they are the latter, then I guess I haven't found them. Are the spells that give disease to the army anonymous, meaning that you don't even get a message about the event? I haven't noticed any events that inform me that I have been hit by an army-bLasting spell. Are some diseases contagious? Maybe he got it from hydras, although I think they got theirs in combat (they can get disease from battle wounds, right?). I really have no clue how this happened.

2) My 100% poison resistant vine ogre got poisoned, and took damage from poison. Granted, he was in the middle of hydra clouds and all, but still, how can this be? The only explanation I see is that he got hit by a bog beast friendly fire, but even then his 100% poison resistance should have made him immune to both poisoning itself and damage from poison, right? Again, I don't get it. I actually still have the save with this battle.

Thanks for the replies.