MS-4792

A 26-year-old female presents to the emergency department with a 2-day history of suprapubic pain and fever. She has no significant medical or surgical history but takes a daily combined oral contraceptive pill and multivitamin. The surgical team orders a CT scan of the abdomen and pelvis, which shows pelvic fat stranding and free fluid in the pouch of Douglas. What is the most probable causative organism?