This is not a comment but a question instead. I was just wondering how the hell can an infectious virus have originated in the first place? That would be just like wondering how did life originate? If mutation can give rise to infetious viruses then logically we should be seeing a lot of these new viruses originating under our very eyes, but we don't. I wonder how the infectious virus originated in the first place?

Hey! I just read under AIDS that saliva and tears have very minute quantities of HIV, but this HIV is not infectious. Then don't the doctor's have the cure for HIV right there, inside the saliva and the tears? I'm sorry for posting again but I'm so bored and I've like nothing to do.

Hey! "For instance, HIV is 10,000 times less concentrated in saliva than blood, which means that you would need 10,000 times more saliva to get infected." If this is true then it means that HIV can exist in saliva and is also infectious, but it is also true that there is something in this environment over which HIV prefers the blood environment more. Also since HIV dies inside the mosquito's stomach so there is something there that can kill the HIV. So that means we can find the cure for HIV. But HIV gives rise to AIDS together with something else present in the environment because many having HIV do not develop AIDS, so we need to find that something too. But we only need to find that something if AIDS can be contracted in the absence of HIV with that something present.