Viral infection

Can a human pass to another human viral infections like influenza or cold? If yes, how? Has to be a sexual intercourse or an exchange of saliva?

[ggreg]

Yes, the flu and colds are spread by human to human contact, by both airborne sneezing and coughing near you and you breathe it in, and by touching mucous or spit left on surfaces and then you put your hand on it and then, say, rub your eye or maybe eat without washing your hands.

It's the HIV virus and STDs that are passed through intercourse, not the cold or flu.  Viruses and bacteria all invade the body differently, depends on which kind it is.

[ggreg]

Oh, and of course you can get a cough or flu by kissing someone, because the spit from the sick person goes directly into the well person.