my .02
Bacteria from someone else's mouth would IMO be more likely to cause infection. I am currently in Microbiology an had to write an article review on bacteria and the human body (how and where it was arranged
Abstract ) Most people have mostly the same bacteria, but each person has different levels and about 20% of the content is different.
Bacteria can be good, when it stays where it is supposed to be, when it gets new places, bad results.
minor wounds, my saliva works pretty good, has for years.
major wounds keep clean as possible.
minor=bleed out, major no outflow to keep clean.
Bleed it out to clean it--old advise that even docs use.