Britain has about twice as many new HIV cases diagnosed annually as other Western European countries, according to new UNICEF figures as reported by Metro. There were 7,734 new diagnoses reported in 2007—nearly twice the amount reported in 2000.

Men who have sex with men (MSM) and immigrants from sub-Saharan Africa were two of the hardest-hit groups, according to the charity. UNICEF U.K. deputy executive director Anita Tiessen said, “It’s not simply a case of people coming here with HIV—there’s a behavior issue.”

According to the article, Tiessen said that sexual behavior among Britain’s young people overall was a key factor in the rise in new infections, leading the government to launch “youth friendly” HIV prevention campaigns. In 2007, one in 10 new HIV infections in Britain was recorded among young people ages 16 to 24, while the same age group accounted for nearly half of Britain’s 400,000 new sexually transmitted infections that same year.