Luckily, I do not touch vanilla, mexican or otherwise. Even among ice cream flavors, it is among my least favored, and has been for years. Something else will get me, but not mexican vanilla.
I've been reading medical texts. I just can't find anything that indicates that overdoses of warfarin can result in sudden onset of serious bleeding.
It's not even really a flavor, it's like 'plain'. Warfarin is a medication used by people with clot problems. Seems like it would have had to be a really heavy dose to make that many people sick.