Cure for AIDS... virtually guaranteed to prevent all new cases!
Don't have extra-marital sex.
17% of AIDS cases come from heterosexual contact.
Don't be gay.
47.2% of AIDS cases come from male-to-male sexual contact.
Don't do injection drugs.
26.6% of AIDS cases come from injection drug use.
6.9% of AIDS cases come from both injection drug use and male-to-male sexual contact.
Which means that only 2.3% of AIDS cases are contracted in any way other than these three.
You know, the Bible warned about this stuff thousands of years ago. Maybe there's a reason God said those things...