An estimated 77,400 people were living with HIV in the UK in 2007 with 28% unaware of their infection.
This compares with the estimated 73,000 reported to be living with the infection in 2006.
In 2007 there were 7,734 new diagnoses of HIV - a similarly high figure to previous years (7,334 in 2006).
31% are being diagnosed with HIV late - at a point after which therapy should have begun - which means that they are missing out on the benefits associated with early diagnosis including prolonged life expectancy.
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