Judging by the article, the deadliness arises when the bacteria make it to the bloodstream. So, although giving head may spread the germs, they're not going to kill anyone unless some supremely vicious throatfucking is going on. (Cf. meningococcal bacteria, which can cause fatal septicaemia & meningitis, but do no harm to the 10%-25% of people asymptomatically harbouring the bacteria in their noses & throats.)
I was just wondering. Human minds are messed up in 1001 ways, but are there a few rational principles that most people already have down? Of course, the answers to this question are probably so extremely obvious that I haven't even considered them. But I ask all the same.