There were 3,425 new cases of HIV last year according to the Public Health Laboratory Service - a rise of 14 per cent compared with 1999 and the highest number of newly diagnosed cases in one year since testing became widely available in 1985.For the second year the greatest number of new infections (47 per cent) were acquired through heterosexual intercourse rather than sex between men (37 per cent).Dr Barry Evans from the PHLS Communicable Disease Surveillance Centre said: 'Many of those being diagnosed are people who were infected some years ago, but are only now coming forward for testing.This is good news, because once people are diagnosed they can seek treatment.'