The search for a cure for Aids was in crisis last night after it was revealed that two supposed "miracle" vaccines not only fail to protect people from the virus, but could put them at greater risk of becoming infected.
It is a massive blow to Aids research, which has ground to a halt - with seven other trials of similarly designed would-be vaccines either suspended or called off indefinitely.
The US government alone pumps £250million a year into research to try to find a "Holy Grail" vaccine which would put an end to Aids.
Now scientists fear the disastrous outcome of the two most promising trials leaves them back at square one.
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