Its possible that you spread it, but if you can't reach the person, I wouldn't overly worry about it.
Aj
I was recently diagnosed with NGU and received one TIME (back and forth once) oral sex, but nothing more and not sure if I exposed my partner. Not sure if I can reach that partner to let them know to get tested, so I was wondering exposure
Its fairly common. That's about the best I can offer - we don't have good stats on it.
Aj