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==Definition==
*infections that are commonly transmitted by sexual activity
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*difficulty of microscopy- endemic treponematoses
**''T. pallidum'' - Syphilis
**''T. ssp pertenue'' - Yaws
**''T. carateum'' - Pinta
*morphologically identical and serologically indistinguishable
*maternal syphilis
**congenital syphilis
***neonatal presentation - poor prognosis
***postnatal presentation - fair prognosis
*importance of syphilis screening during pregnancy
===genital herpes===
*Herpes simplex
===chancroid===
*''Haemophilus ducreyi''
*Azithromycin
===lymphogranuloma venerum (LGV)===
*''Chlamydia trachomatis'' L1,2,3
**different serovars from genital chlamydiasis
*rare; increasing among MSM in Europe and US
===donovanosis (granuloma inguinale)===
*''Krebsiella granulomatis''
*India, Papua New Guinea, Brazil, Caribbean
*microscopy shows Donovan bodies similar to lieschmania
===''Chlamydia trachomatis'' serovars A, B, Ba, C===
*cervicitis and urethritis in females
*urethritis in males
*neonatal conjunctivitis
*classical ocular trachoma
*worldwide resistance against azithromycin
===gonorrhea===
*''Neisseria gonorrhoea''
*microscopic investigation tends to be false-negative in female gonorrhea
===ophthalmia neonatorum===
*etiology
**gonorrhea
**chlamydia
**herpes simplex
**and more
===human papilloma virus===
==Epidemiology==
***problems with partner notification; stigmatization
***only symptomatic STIs treated
==Control==
*Primary prevention
**risk reduction
**condom distribution
**health education
**vaccine
*Secondary prevention
**promote early healthcare seeking behavior
***facility based
***online self test; send self-sampling test kit
**health education
**contact tracing
<math>R_0 = B \times C \times D</math>
*<math>B</math>: transmission coefficient ←condoms, education
*<math>C</math>: mean rate of partner change ←
*<math>D</math>: mean duration of infectiousness ←
