When you say "ill", what do you mean? Is there a specific infliction that takes the victim of Malboro's breath?

[Zelda had read quite a number of passages about the foul creatures, in what witness accounts she could find to study. It had been said that a Malboro breath could cause any number of foul and terrible effects. From making a subject confused, to temporarily blinding them, poisoning them or even outright killing them on the spot in some rare cases. There had been very few creatures that Zelda had personally stood before the maw of, and it seemed a good idea to not start doing so even if the chance to do so came with studying a species never seen by her before.]

I've.. read a number of things about them, but you seem to speak of them with such experience.