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PM urges greater HIV awareness in World Aids Day video

1 December 2012 Last updated at 09:26 GMT

Around 25,000 people in the UK are thought to be unaware that they are infected with HIV, according to the Health Protection Agency.

In a video message to coincide with World Aids Day, Prime Minister David Cameron has said there is still too much ignorance about HIV and Aids.

Clare Burton reports.