The sexual health of young UK adults worsened in 2006 despite a concerted public health effort to turn it around, figures show. In 2006, a total of 376,508 new sexually transmitted infections (STIs) were diagnosed – up 2.2% on 2005, the Health Protection Agency found in Testing Times – HIV and other Sexually Transmitted Infections in the United Kingdom: 2007 Young people aged 16-24 made up the bulk of cases of some of the most common STIs, including chlamydia. The report also warns of a continuing HIV and STI epidemic in gay men.