The recent study has given hope of developing effective vaccine against AIDS, which takes 2 million lives each year. Research team has identified two new antibodies, which have potential to fight the disease.

Research team led by the International Aids Vaccine Initiative (IAVI) used powerful screening technology to identify two infection-fighting proteins in blood taken from an African who although infected with HIV showed no symptoms.

Research team also identified the genes used by the donor's body to build the "broadly neutralising antibodies". They believe that this could lead to development of gene therapies to treat people already infected with HIV and vaccines to stop its spread.

Study showed that PG9 and PG16, the newly found antibodies target regions of the virus that remain constant even as the virus mutates. These antibodies are produced by a minority of people with HIV.

Wayne Koff, of the IAVI, said: "The findings themselves are an exciting advance toward the goal of an effective Aids vaccine because now we've got a new, potentially better target on HIV to focus our efforts for vaccine design."