**core groups ⇄ bridging population ⇄ general population
**size of each group differs among different countries
==Presentations==
*genital ulcer
*urethral discharge
*vaginal discharge
*inguinal swelling
*scrotal swelling
*lower abdominal pain
*neonatal conjunctivitis
*warts/carcinoma
*hepatitis
*fever
==Diagnosis==
==Treatment==