Spanish researchers found that 22 of 24 healthy people (92 per cent) developed an immune response to HIV after being given their MVA-B vaccine.
The injection contains four HIV genes which stimulate T and B lymphocytes, which are types of white blood cells.
The study showed that almost three-quarters of participants had developed HIV-specific antibodies 11 months after vaccination.Over a third developed one type of T cell that fights HIV, called CD4+, while over two-thirds developed another, called CD8+.
Overall, 92 per cent developed some sort of immune response. However, that is not the same thing as being protected from HIV infection: the response could be inadequate to provide protection.
Prof Esteban acknowledged the vaccine was at an early stage, describing it as "promising".
The next step is to test it in people with HIV to see if it works as a "therapeutic" - reducing the viral count.
The researcher was optimistic, saying: "MVA-B vaccine has proven to be as powerful as any other vaccine currently being studied, or even more.
"If this genetic cocktail passes Phase II and Phase III future clinic trials, and makes it into production, in the future HIV could be compared to herpes virus nowadays."
By that he meant HIV could become a "minor chronic infection" that only resulted in disease when the immune system was otherwise compromised.
Other vaccines are in development. One, called the HIV-v vaccine, developed by British researchers, resulted in a 90 per cent reduction in viral count in HIV-infected people. Most trials so far have been small scale.
There have also been many false dawns with prospective HIV vaccines.
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