>use saliva to "disinfect" a scrape
This only works best for animals because they have no choice but to gamble on the bacteria lurking in their saliva to not infect them with something nastier. Just use soap and water, it's not worth the gamble.
@Tactless cool fact about the human body, we may not have the strongest bite but we have the second most infectious one in healthy individuals. So human saliva is one the worst thing to put in an injury, literaly saliva of anything else (eccept obviously a comodo dragon) is a better choice