Understanding Sexually Transmitted Diseases

And it's a sexually transmitted disease.

Therefore, sexual contact spreads the disease. It was very simple. It's straightforward epidemiology.

You take an infectious agent and you introduce it into a population

in which the spread among those individuals, if its sexual contact spread, it's a perfect setup to spread.

You don't have to remember all this. Just merely get the concept

that if teleologically I wanted to pick out the one cell,

that if I damaged that cell, I would do the most damage to the immune system.

I, as an immunologist, would pick out the T4 cell.

Well, it's certainly nice to know that the future looks brighter.