The first two doses contain fragments of HIV DNA, which prime the patient's immune response system. The second two doses contain an altered poxvirus designed to boost the immune system.
It worked in rhesus macaques, protecting 22 of 23 vaccinated monkeys from AIDS for more than 3 1/2 years.
This is actually really amazing. HIV/AIDS is one of the most highly rampant diseases of the world, especially in many African nations where proper health care is very hard to come by. I remember reading stats of like 1 in every 4 people in Africa have the disease, not to mention countless others spread across the entire world.
With new technology and new research projects on the cure for this disease, im sure that we are as close to a cure as we've ever been before. This new HIV vaccine trial to begin soon is by no means a 'cure' but it a giant step towards it. Check out the link below to read the article, its an interesting read and hopefully leads to bigger things in the search for a cure for HIV AIDS.