Plague Carriers: How do you identify them?

[Zatoichi]

When you open the unit card for the army, isn't there a skull in the top right hand corner? - it's only there if the unit has the plague. Or am I halucinating again?

As for your second question, yes, given time, your characters and armies will recover from the plague (if it doesn't kill them all first, of course). I usually try and keep my infected troops/characters in the place they caught the plague until it's run it's course, although plenty of people here seem to favour a dastardly bio-terror approach (which I guess is pretty historical, just not my style).

One thing I'm not sure of though is if it's worth retraining troops with the plague each turn they lose men, or whether just to do it at the end of the plague?

Edit - gah! You beat me to it with your clever and concise post!