International drug company Merck has suspended work on an experimental vaccine that was regarded as one of the most promising in the fight against HIV, the virus that can lead to AIDS.
Testing of the drug has stopped after a monitoring panel judged it to be ineffective.
The experiment called 'STEP' began three years ago, enrolling 3,000 volunteers.
All of them were initially free of HIV but they were at high risk of contracting the virus.
Most were homosexual men or female sex workers and Merck says they were repeatedly counselled about how to reduce their risk of HIV infection.
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