what are the causative organisms of stds?
['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.']