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AIDS vaccine

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An experimental aids vaccine may not be as effective as researchers had hoped.

Last month, Thai scientists reported the vaccine appeared to lower the risk for infection by nearly a third.

Now a more thorough analysis suggests the vaccine may only offer a small benefit to the general population, rather than proof it was effective.

Analysts say the results could also have been chance findings.

This is the latest setback in more than two decades' worth of research into an AIDS vaccine.

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