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SPAIN— A vaccine that temporarily enables the immune system to deal more effectively in infected patients has scientists impressed.

AFP reports that the vaccine, is based on immune cells exposed to HIV that had been inactivated with heat. The vaccine was tested on a group of 36 HIV positive people.

The study, published in Science Translation Medicine, showed that there was a dramatic drop in the patients' viral loads after the vaccine was administered.

Viral load in patients dropped, by over 90%, in 12 of 22 patients who received the vaccine, in a 12 week trial. However the effectiveness of the vaccine began to decline after 24 weeks, in all but seven of the 20 remaining patients.

After a year, the vaccine lost its effectiveness, and patients had to return to their regular combination therapys of anti-retroviral drugs.


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