I'd like to see the evidence to back up this claim.

 I used to work for Cargill Meat Solutions which is the largest beef supplier to restaurants in the US.  Over half (52%) of e Coli outbreaks are foodborne, not oral-fecal as you suggest, with a whopping 43% being fast-food restaurants.  68% of the outbreaks at fast-food restaurants are linked to frozen beef patties, which is what Cargill produces.  Cargill is the supplier for Walmart and McDonalds (under the name Excel Meats).  I can tell you exactly how the e Coli gets into the meat--intestines of the beef are processed with the meat. 

When the patties are undercooked, which can happen from time to time, e Coli isn't killed.  That's why McDonalds uses steam trays, to kill any residual germs and keep the meat hot. 

Don't even get me started on ground turkey.  I wouldn't use it for anything but chili and I would cook it all day before I ate it.