Sexually transmitted diseases (STDs) are caused by various pathogens, including bacteria, viruses, and parasites. Here are some of the common causative agents:

Bacteria:
– Chlamydia trachomatis: Causes chlamydia.
– Neisseria gonorrhoeae: Causes gonorrhea.
– Treponema pallidum: Causes syphilis.

Viruses:
– Human Immunodeficiency Virus (HIV): Causes AIDS.
– Herpes Simplex Virus (HSV): Causes genital herpes.
– Human Papillomavirus (HPV): Causes genital warts and is linked to cervical cancer.
– Hepatitis B and C: Cause liver infections.

Parasites:
– Trichomonas vaginalis: Causes trichomoniasis.
– Crab Lice (Pthirus pubis): Causes pubic lice.
– Scabies Mites (Sarcoptes scabiei): Cause scabies.

Fungal:

Fungal sexually transmitted diseases (STDs) are relatively rare compared to bacterial and viral STDs. One example of a fungal STD is Trichophyton mentagrophytes, which causes ringworm

These pathogens can be transmitted through sexual contact, including vaginal, anal, and oral sex. Regular testing, safe sex practices, and open communication with partners are key to preventing STDs.