An experimental AIDS vaccine has for the first time cut the risk of infection in a “breakthrough” in the quarter-century battle against the deadly epidemic.

The vaccine is believed to reduce the risk of being infected by almost a third, after the world’s largest clinical vaccine trial of more than 16,000 volunteers was carried out by the U.S. Army and Thailand’s Ministry of Public Health.

A vaccine only protects against a possible infection but is not a cure for the more than 30 million people already infected with AIDS.

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A vaccine only protects against a possible infection but is not a cure for more than 30 millions of people already infected with Aids.