The nurse is assessing a 16-year-old sexually active patient…

The nurse is assessing a 16-year-old sexually active patient in the family practice clinic. The patient’s symptoms include breakthrough vaginal bleeding, abdominal pain, nausea, and fever. The health care provider obtains cultures of the cervical epithelial cells during a Pap smear and orders doxycycline 100mg orally twice a day for 7 days for her and her partner. The nurse understands that this prescription is consistent with the treatment of which medical diagnosis?