Sexually transmitted infections (STI), also previously referred to as sexually transmitted diseases are illnesses that has a significant probability of transmission between humans by means of human sexual behavior.Some STIs can also be transmitted via the use of IV drug needles after its use by an infected person, as well as through childbirth or breastfeeding.

Cause of STI
Bacterial
    Chancroid (Haemophilus ducreyi)
    Chlamydia (Chlamydia trachomatis)
    Granuloma inguinale or (Klebsiella granulomatis)
    Gonorrhea (Neisseria gonorrhoeae)
    Syphilis (Treponema pallidum)
Viral
    Viral hepatitis (Hepatitis B virus)
    (Note: Hepatitis A and Hepatitis E are transmitted via the fecal-oral route; Hepatitis C is rarely sexually transmittable,and the route of transmission of Hepatitis D (only if infected with B) is uncertain, but may include sexual transmission.
    Herpes simplex (Herpes simplex virus 1, 2) skin and mucosal, transmissible with or without visible blisters
    HIV (Human Immunodeficiency Virus)—venereal fluids, semen, breast milk, blood
    HPV (Human Papillomavirus)—skin and mucosal contact. 'High risk' types of HPV cause almost all cervical cancers, as well as some anal, penile, and vulvar cancer. Some other types of HPV cause genital warts.
    Molluscum contagiosum (molluscum contagiosum virus MCV)—close contact..

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