[iammjm]

Considering the popularity of porn and its obvious impact on sexual practices (monkey see, monkey do) plus the higher hygiene standards I would imagine butt-eating is more widespread now then ever. I’d also imagine cleaning the soon to be eaten butt would lower the risk

[nick__m]

You got the infection route backwards, the cancer causing plaque bacteria migrate from mouth to butt !

But more seriously it's a gram negative bacteria so it has a polysaccharide armor that could resist a passage through the digestive system.