Causes of Sexually Transmitted Infections

Causes of Sexually Transmitted Infections

Cause

Infection

Bacteria

Chancroid

Chlamydial urethritis and cervicitis

Gonorrhea

Granuloma inguinale

Lymphogranuloma venereum

Mycoplasma infections

Syphilis

Viruses

Genital herpes simplex

Hepatitis B

Hepatitis A and hepatitis C*

Human papillomavirus (HPV) infection

Human immunodeficiency virus (HIV) infection

Molluscum contagiosum* (caused by a poxvirus)

Mpox (formerly called monkeypox)*

Zika virus*

Parasites (protozoa)

Trichomoniasis

Ectoparasites

Pubic lice infestation*

Scabies* (due to burrowing mites)

* These infections typically are not considered sexually transmitted infections (STIs) but can be spread by sexual contact (see Transmission of STIs).

* These infections typically are not considered sexually transmitted infections (STIs) but can be spread by sexual contact (see Transmission of STIs).