Okay, a bit of counterpoint then.
McDonalds supplier page:
http://www.mcdonalds.com/us/en/food/food_quality/see_what_we_are_made_of/meet_our_suppliers/keystone_foods.html
Of course to be expected the company utilizes a lot of farm images, clean photos, and limited information about their process. The truth is that no one can really blame them for that, it's just advertising strategy.
This one is a recent article (two days ago) about the removal of Ammonium Hydroxide from their hamburger meat in the US.
http://news.nationalpost.com/2012/01/26/mcdonalds-drops-use-of-pink-slime-in-u-s-meat/
Discussion of McDonalds' chicken processing is rather scarce, aside from a few food critics bashing new "Chicken McBites" so I'd take
>>22's word for it over the ranting wordpress "Doctor."
Anyway, the truth is that the girl's condition had little to do with the quality of McDonalds foods at all. If she ate nothing but farm-fresh apples, and absolutely nothing else a similar incident would have occurred. The human system requires all different forms of materials to survive, therefore different kinds of food must be eaten.