1. The case fatality rate for AIDS has declined from 22% in 1987 to 0.8% in 1998.
2. AIDS, compared to SARS, is not contagious unless you share bodily fluids.
More specifically you need to screw around, share needles, or do that back door stuff if you're a guy attracted to another fellow to catch AIDS. SARS is more contagious but less lethal.