Well, if it’s just as likely as any other meat I’ll begin eating blue pork and see how that works out - plus, if your beef has o157 I suggest you send your food safety agency to the butcher / (s)laughter house and see where they went wrong. Also, fast-food beef is likely to be minced - in which case you’d need to cook that fucker through and through to make it anywhere near safe. (Yeah, yeah. I hear you, steak tartare people)