Question: what are stds caused from?
Answer: Bacteria, including chlamydia, gonorrhea, and syphilis.
Viruses, including HIV/AIDS, herpes simplex virus, human papillomavirus, hepatitis B virus, cytomegalovirus (CMV), and Zika.
Parasites, such as trichomonas vaginalis, or insects such as crab lice or scabies mites.