Scientists realized the little they know about how HIV vaccine and the immune system of the body work together. The developed HIV vaccine that was supposed to be released in the United States was canceled on Thursday.

Great efforts have been made to develop the HIV vaccine back in the ’80, when the government promised a marketed vaccine by 1987.  This vaccine was supposed to be the biggest weapon against AIDS pandemic. Still, a great number of other HIV vaccines are been tested around the world.

But the potential vaccine was made to stimulate the immune system in a different way. The director of the National Institute of Allergy and Infectious Diseases, Dr. Anthony s. Fauci, said that there had to be done more researches on animal and humans before marketing it.

The unknown nature of the HIV virus has given a big threat to scientists all around the world. Last year, another vaccine failed. It was produced by Merck and Dr. Fauci’s agency helped with the money they needed.

It seems that the failure went on because scientists then didn’t know that immune reactions are the most important when preventing the infection.

The vaccine was supposed to lower the amount of the HIV virus in the body. Still, the threat for this probability was to see whether the vaccine could eliminate the virus in the last stage of the disease.

All findings were released after a study made on 30 people infected with HIV. The National Institutes of Health paid for the study. They still hope to find something strong enough to destroy the hardest disease in the human history.