Chlamydia trachomatis (subacute, often undiagnosed), Neisseria gonorrhoeae (acute).

C trachomatis – most common bacterial STI in the US.

Signs:- Cervical motion tenderness- Adnexal tenderness- Purulent cervical dischargePID may include salpingitis, endometritis, hydrosalpinx, and tubo-ovarian abscess.

- Salpingitis is a risk factor for ectopic pregnancy, infertility, chronic pelvic pain, and adhesions.

Can lead to perihepatitis (Fitz-Hugh-Curtis syndrome) – infection and inflammation of liver capsule and "violin string" adhesions of peritoneum to liver.