Sexually Transmitted Diseases (STDs) Causes

 Depending on the disease, STDs can be spread with any type of sexual activity. STDs are most often caused by viruses and bacteria. The following is a list of the most common STDs, their causes and other infections (see STDs with asterisk mark*) that may be transmitted on occasion by sexual activity, but are frequently not considered primarily to be an STD by many investigators:

STDs caused by bacteria

•Chancroid (Haemophilus ducreyi)

•Chlamydia (Chlamydia trachomatis)

•Gonorrhea (Neisseria gonorrhea)

•Granuloma inguinale (Calymmatobacterium granulomatis)

•Lymphogranuloma venereum (Chlamydia trachomatis)

• Syphilis (Treponema pallidum)

STDs caused by viruses

•Genital herpes (herpes simplex virus)

• Genital warts (human papillomavirus virus [HPV])

•Hepatitis B and D, and infrequently, A*,C*,E* (hepatitis viruses, types A-E)

• HIV/AIDS (human immunodeficiency virus [HIV virus])

•Molluscum contagiosum* (poxvirus)

STD caused by protozoan

• Trichomoniasis (Trichomonas vaginalis)

STD's* caused by fungi

 • Jock itch (Tenia cruris)*

•Yeast infections* (Candida albicans)

STD's caused by parasites

 •Pubic lice or crabs (Pediculosis pubis)

•Scabies*  Sarcoptes scabiei

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