I had Streptococcus Sanguinus, a typical oral bacteria, in my Aortic valve. It has eaten the valve until it was back flowing by 75%, so I needed four pumps to match one normal pump.
They said the source was probably biting my cheek, ADHD comes with lots of benefits, so yeah, not a virulent or particularly dangerous bacteria, just in the wrong place. Got the valve replaced, now I am on Warfarin for the rest of my life, but wow, I am glad to be in Australia, the only money I spent was on snacks. I was flown to and from hospital, 6 weeks in hospital, surgery with 11 staff, and not a single solitary cent spent.