Many people walk around without HIV thinking they have never been with a HIV person. Well, they could be wrong. They might have been with an infected person but there were no cuts and tears in the sexual membranes to cause infection. That is for sex. But how many chances like those can one take?
With the blood, that is another story. You mean like injection of the blood? Blood has the highest concentration of HIV and infection is easy. Again, if there is no way into the bloodstream, HIV will not occur.
Great question. Hope I have answered it.
Alway
Muthoni (Mson)