dr. jane leavy, among one of the first to discover the virus in the 80's believes that i the drugs may help the virus to mutate into a different form, one that we cannot treat. >> i am quite concerned if we continue to advocate the use of drugs in this country or in europe, we may be breeding a multi resistant virus that can come back and haunt us. >> it can occur when there is too little drugs in the body the doctor said that most anti-retro viral cocktails remain effecti effective. >> they maintain efficacy, i think we're a long way off from this situation where the h.i.v. will become significantly more difficult to treat. >> but only three in ten h.i.v. americans have the virus under control and developing new drugs is bleak. >> we're now where we don't have a lot of up coming drugs. also the targets are different. >> at this moment drugs are working, hopefully. i'm afraid of the future. some day it may stop work or it will bring me other problems. most scare me now. >> for the moment the strategy is to medicate as many people as early as possible holding the virus off until someone find