Sexually transmitted diseases can be caused by pathogen such as virus, bacteria or parasites.  These diseases are transmitted through sexual contact from one person to another person. Sometimes sexually transmitted infections can be transmitted through a non sexually way too.
Non sexual ways of transmission includes:
  • From mother to child during  pregnancy or breastfeeding
  • Through blood transfusions
  • Shared needles
1. Sexually transmitted diseases (STD) cannot be transmitted through physical contact.
2. STD is also called sexually transmitted infection (STI) or venereal disease (VD).
In this subtopic, we will learn about the following diseases in detail
  • Gonorrhoea
  • Syphilis
  • Genital herpes
  • Genital warts 
  • AIDS
Sexually transmitted diseases by bacteria:
Disease: Gonorrhoea
Causative organism: Gonorrhoea Neisseria
Gonorrhoea Neisseria
Mode of transmission: Sexual contact

Tissue/Organ affected: Urethra is affected
Gonorrhoea infection

Symptoms:  Discharge from genital openings, pain during urination.
Treatment: Gonorrhoea infection can be treated and cured with antibiotics such as ceftriaxone which is given in the form of an injection, and azithromycin via oral.
Disease: Syphilis
Causative organism: Treponema pallidum

Treponema pallidum
Mode of transmission: Sexual contact

Tissue/Organ affected: Minute abrasion on the skin or mucosa of the genital area.
Different stages of Syphilis

  • Ulceration on genitals
  • Skin eruption
Treatment and prevention of syphilis
Treatment: Syphilis can be treated and cured with antibiotics such as penicillin, doxycycline, azithromycin and ceftriaxone.