Earlier on BGG :-)
As I recall, it was ruled before that even if a hero already has a condition, it still counts as being Poisoned or whatever if something happens that would give it to them again. This means Infector cards can still trigger when a hero is repeatedly hit with conditions. After a few quests are past and you have some Plot cards, bring in the Bol'Goreth agent — who can deal Poison AND Disease with a surge — and use Affliction Aura on him, and you could very quickly have tons of infection tokens to take advantage of.
Maybe this is less effective than I think; I haven't tried it yet. But from checking out the cards it seems like it would work.
I was wondering if this strategy has been tried yet? I'm setting up to use it myself, tnx!