Chlamydia rates increased by 4 per cent between 2005 and 2006, with the 113,585 diagnoses made in GUM clinics.
However, sexual behaviour may be improving, said the HPA. Rates of gonorrhoea fell by 1 per cent, indicating that the number of people with new STIs is levelling off.
But in females aged 16 to 19 a worrying rise in cases of genital herpes is being seen, with rates 16 per cent higher in 2006 than in 2005.
The HPA is also concerned that rates of all STIs are rising in homosexual men.
HPA STI data for 2006
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