20032004200520062007New STI diagnoses190,79192,01489,82389,70496,223Other STI diagnoses168,95473,07276,38672,65279,607Total STI diagnoses159,745165,086166,209162,356175,830 1 Includes diagnoses defined the in notes 5 and 6 to the following tableNotes:1. The data available from the KC60 statutory returns are for diagnoses made in GUM clinics only. Diagnoses made in other clinical settings, such as General Practice, are not recorded in the KC60 dataset.2. The data available from the KC60 statutory returns are the number of diagnoses made, not the number of patients diagnosed.3. The information provided has been adjusted for missing clinic data. 4. Data are unavailable for 2008.5. New STI diagnoses include: Chlamydial infection (uncomplicated and complicated), Gonorrhoea (uncomplicated and complicated), Infectious syphilis, Genital Herpes, simplex (first attack), Genital warts (first attack), New HIV diagnosis, Non-specific genital infection (uncomplicated and complicated), Chancroid/lymphogranuloma venerum (LGV)/Donovanosis, Molluscum contagiosum, Trichomoniasis, Scabies, Pediculus pubis.6. Other STI diagnoses include: Early latent, congenital and other acquired syphilis, Recurrent genital Herpes simplex, Recurrent and re-registered genital warts, Subsequent HIV presentations (including AIDS), Ophthalmia neonatorum (chamydial or gonococcal), Epidemiological treatment of suspected STIs (syphilis, Chlamydia, gonorrhoea, non-specific genital infection).Source:Health Protection Agency, KC60 returns

In addition to STIs diagnosed in GUM clinics, the National Chlamydia Screening Programme (NCSP) provides Chlamydia screening to asymptomatic people under the age of 25 years of age in England. The NCSP was launched in 2003, when a phased implementation started. The following table shows the number of diagnoses made of Chlamydia in patients between the ages of 15-24 years between 1 April 2003 and 31 December 2008 London Primary Care Trusts (PCTs).