Cut on lip: Saliva contains many things, good and bad. It contains 'antigens' = compound to fight against bad bacteria, viruses, sometimes even fungus in mouth. If you are worried about virus specifically, viruses can penetrate through the delicate mouth surfaces as well as jumping right into the blood stream from cuts. Indeed, the mouth works as a gateway for all good ; bad things that try to enter the body.
Answered 3/31/2014
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