www.bbc.co.uk/news/health-11072853 - 2009 report.
Experts at the Health Protection Agency (HPA) say young people are most affected.
And one in 10 of 15-24 year olds with an STI become infected again within a year.
Health ministers said they would look at what more could be done to increase young people's awareness of risks.
The 482,696 new cases represent a 3% rise from the 2008 figures, continuing a "steady upward trend" that the HPA said had been seen over the past decade...
...Dr Gwenda Hughes, an STI expert at the HPA, said: "These figures highlight the vulnerability of young women.
"Many studies have shown that young adults are more likely to have unsafe sex. Often they lack the skills and confidence to negotiate safer sex.
"Re-infection is also a worrying issue. Teenagers are repeatedly putting their own and others' long-term health at risk."...
Dr Colm O'Mahony, a consultant physician in sexual health, told BBC Radio 5 live, that the safe sex message was still not getting through to young people.
"In general, most STIs occur in young people because they lack the knowledge and self-esteem to actually avoid getting sexually transmitted infections - and that's what we've been shouting about for years," he said...
Sexual health charities described the figures as "alarming" and joined the HPA in urging people to use condoms, and to have a health check if they have had unsafe sex.
Natika Halil, from the FPA, said: "Young men don't wear condoms and it appears it's young women who end up with the infection.'
The myth that any interference whatsoever with the penis au natural will result in sexual dissatisfaction on the part of men is really, really hazardous to the health and welfare of women.
Be very, very careful what myths you spout therefore.
When posters here repeat the untruth that men who are circumcised have diminished sexual pleasure compared with uncircumcised men, apart altogether from the fact that studies have proved this wrong, what they are stating is the principle that the sexual satisfaction of men is the be all and end all of sex, and the health and welfare of their partners does not matter.