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STDs (sexually transmitted diseases) are often divided into two categories viral and bacterial. Viral STDs are HIV, hepatitis B, Genital herpes, HPV, Molluscum Contagiosum etc.

HIV (human immunodeficiency virus) -  is transmitted in body fluid and targets helper T cells of the immune system.

hepatitis B - is usually spread by sexual contact and its virus is more contagious than the AIDS virus. hepatitis B is linked to liver cancer

genital herpes - is caused by the herpes simplex virus, resulting painful blisters on the external genitals of males and female.

HPV (The human papilloma virus) - is marked with symptoms of Warts on penis, vulva, urethra, labia, around and in the anus, or in vagina or cervix, there is risk factor for cancers of cervix

molluscum contagiosum - is a skin disease marked by raised, pearl-like, fluid-filled bump s on the skin

Note: Bacterial STDs are, bacterial vaginosis, chancroid, chlamydia, gonorrhea, syphilis, lymphogranuloma, mycoplasma genitalium