Bacteria:
* Chlamydia: *Chlamydia trachomatis*
* Gonorrhea: *Neisseria gonorrhoeae*
* Syphilis: *Treponema pallidum*
* Chancroid: *Haemophilus ducreyi*
* Pelvic inflammatory disease (PID): *Chlamydia trachomatis* and *Neisseria gonorrhoeae* are the most common causes.
Viruses:
* HIV/AIDS: Human immunodeficiency virus
* Herpes: Herpes simplex virus (HSV) - types 1 and 2
* Genital warts: Human papillomavirus (HPV)
* Hepatitis B: Hepatitis B virus
* Hepatitis C: Hepatitis C virus
Parasites:
* Trichomoniasis: *Trichomonas vaginalis*
* Pubic lice ("crabs"): *Pthirus pubis*
* Scabies: *Sarcoptes scabiei*
It is important to note that some of these organisms can also be transmitted through other means, such as contact with infected blood or bodily fluids.
