>> well, the hiv development of drugs and treatment is an extraordinary success story of the relationship between fundamental research developing an intervention that's highly effective. i have been taking care of hiv infected individuals for the last 35 years. the first several years virtually all of my patients died. they would come in and we didn't know what the virus was and we didn't have therapy. now we have therapy. if you put them on a combination of three drugs you can look that person in the eye and say if they take their medications regularly they could live an additional 50 years. >> and if they take it regularly they could not pass on the virus. >> it's called treatment as prevention. you bring down to below detectable level. >> i don't think a lot of people understand that. they have done where one person