Yes...more then you have ever seen.
Ya,your answers are great, just want to know about, if infection is through the blood, does it need an enough amount of blood for infection?
I don't know what you are asking. I gave you 2 great answers. Think it is time to move on.
Is it also mean that enough amount of blood for invection?
In healthcare settings it is possible to be stick by a needle. In this case it is possible to become infected with HIV. It is a rare occurance in the healthcare field and does not happen outside of that.
I heard that some infection are infected by medical affairs, such as doctors and nurse? In fact how did it happen?
"Concentration of virus in the blood" means the viral load of the person. So a recent infection of HIV by someone usually means a high viral load. Someone on medication means a low viral load and less of a chance to pass on the infection.
Getting HIV from cuts does not happen.
So is it needed the blood is bleeding for infection? No bleed no infect? What means concentration of virus in the blood?
it depends how long that cut was there for...if it is a fresh cut then its a risk.