There's a Wonder Drug That Prevents HIV Infection. Why Haven't You Heard of It?

[Yo_Mama]

17. You've got to wonder, don't you?

I do think it would work well for those in the sex trade.

What the studies have shown so far is that it will work well especially in combination with other preventive measures.
http://www.cdc.gov/hiv/prevention/research/prep/

But then, condoms work well too, if used consistently.

Truvada provided 44% additional protection:
http://www.cdc.gov/nchhstp/newsroom/iPrExMediaStatement.html

This approach is called pre-exposure prophylaxis, or PrEP; trial findings showed that a once-daily pill containing tenofovir plus emtricitabine (brand name Truvada®) was safe and provided an average of 44 percent (95% CI 15 to 63%) additional protection against HIV infection to men who have sex with men (MSM) and transgendered women who have sex with men, who also received a comprehensive package of prevention services. These services included use of condoms, monthly HIV testing, counseling, and management of other sexually transmitted infections. The level of protection shown varied widely depending on how consistently participants used PrEP. Among those whose data (based on self-reports, bottles dispensed, and pill counts) indicate use on 90 percent or more days, HIV risk was reduced by roughly 73 percent (95% CI 41 to 88%), while among those whose adherence by the same measure was less than 90 percent, HIV risk was reduced by only about 21 percent (95% CI, from a 52% reduction to a 31% increase).

It has been shown to be pretty safe, which is important.