User blog comment:Miskos3/Fairy Tail Chapter 367: Jellal vs. Oracion Seis, Review/@comment-4829046-20140117120656/@comment-7418318-20140117194139

I wouldn't be surprised if Zero was somehow able to destroy the poison within his body, but that'd still leave the gaping wound that Erik caused him...

But then he said something about developing hundreds of spells, so he might also have a contingency for that, even if it's just some kind of barrier spell that temporarily prevents him from bleeding to death until he has time to force some poor doctor to treat his wound.