The sexual health charity AVERT has said that any new HIV vaccine needs to be accessible to those areas of the world that are most affected.
Julie Cassard, information and campaigns officer at the organisation, made her comments following the news from the World Health Organization that a potential vaccine for HIV has been tested in Thailand and recorded 31.2 per cent efficacy.
She pointed out that if the vaccine is manufactured on a large scale then it could cut down the incidence of HIV, but that the worst-affected areas of the globe are in developing countries, which may not have the money to buy the medication.
Ms Cassard explained: "The question of accessibility would have to be looked at and pharmaceutical companies would have to make it cheap and available for anyone."
The regions that she listed as having the highest rates of HIV are sub-Saharan Africa and the Caribbean.
Research by the National Aids Trust shows that 31 per cent of HIV sufferers have not yet been diagnosed.