i prescribed trev arda and 50% of the people that present asking for it don't get it.hey getother interventions and other things that i offer to them. >> what about the cost? >> it is significant. the guide lines are important in changing the game. they are in definitive. they are something that changes policy. it costs money, it's not a free intervention and insurers are paying for it. the question is what about the people at risk who are not unsured or uninsurable. that's what the guidelines are weresing. >> your organization has an incred ble perhaps. could true varda have an influence in nations battling the epidemic? >> i think in the previous pieces with the doctor, the emphasis has to be an treating people with live. these drugs are just as effective in blocking the spread of h.i.v. in people who are infected. it's up to 100%. there are countries around the world that have a significant majority of h.i.v. population on treatment, and you see infections go down. namibia, ghana, cambodia - they were on a trajectory to eliminate h.i.v. by 2020 because of mass use o