I've got a flyer at the office that we give to patients who are newly diagnosed with HIV or who are worried about contracting it. It breaks down the different risk levels associated with the various ways it's possible to contract HIV.

I'll snag one tomorrow and post it up.

And no, it's not possible for HIV to just magically "appear", someone somewhere along the line has to have been infected in order to spread it. I thought this was covered in like basic high school science and biology?