infected bgay men, about 40% of pple infected herere female, which nearly twice e percentage of women infeed in the united ates. >> i think itould be goodif we could repeal theodomy law in jamaica, becse that would send a snal to thekay community at they're part of this society. >> reporter: politil sensitivities make it dfficult for the mistry of health to enly address the needs of th gay community. instea it quietly subcontracts most of the work to independent organization >> homophobe makes our work difficult becausthese gayen are terrified of seeking health services. when they come in us, it's usuallat a point where they're almost dying. >> reporter: ts is head of jamaica's pport for life, the main group dealin with live tabd gay community. but even here the work must be ne covely. >> we most definitel nnot real our locatn or even the type of wo that we do with the gay communityinamaica to the general public. we can't print brocres or poers and put them anywhere. we have had one of our program administratorsbducted and killed this is a threator all the people that work in these communits

in 2003 and involved more than 16,000 volunteers, men d women age18 to 30 at average risk becoming infeed. for three years, half were given the vaccines. the otr half, placebo injections andere monitor for anoth three years. both drugs stimulate dferent aspects of the immune stem to fight hiv but had been deemed ilures on their own. vaccine one alvac uses a disabled poxvirus with genetic materialrom hiv inserted into it. it prompts th bodies toake "t" cells kill the infection. vaccine contns an h protein lled gp20. it encourages the body to produce antibodies to dstroy v before the virus can infect healy cells. us together, there's a 31.2% lowerisk of infection. >> this is the first time we c improve the vaccine mproves infection -- which is the fst stepping-stone for furer vaccine developmen >> 31% isxtremely low for a vaccinand there's concern abouhowffordable and fective they could be on the scale needed in asia and b-saharan rica. 2 million peopleied of aids in 07. nely 7,000 are infecwith hiv every y. with sexual behavior a big part of the problem, could hopes of a vaccine encourage