Question: what are the two main categories of stis?
Answer: Human Immunodeficiency Virus (HIV) and Acquired Immune Deficiency Syndrome (AIDS) ... 
Chlamydia. ... 
Gonorrhea. ... 
Pelvic Inflammatory Disease (PID) ... 
Genital Warts and Human Papillomavirus (HPV) ... 
Genital Herpes (HSV-1, HSV-2) ... 
Syphilis. ... 
Symptoms That Suggest Sexually Transmitted Infections May Include: