actually, guys the vaccacine is a very weak virus. The problem with most colds and diseases, such as HIV, is that they change thier appearance. What i mean is that most virus have a set code so that the body can create a antibody against it. The cold for example always changes its code so there are never antibodies to combat it. Same thing with HIV, they change there code while in the body so they can infiltrate the t cells and destroy them. Now, wothout those T cells, other viruses, such as strep throat, and flourish inside our bodies and not be beaten. And thats what kills us