A 24-year-old man presents to the clinic with a 4-day histor…

A 24-year-old man presents to the clinic with a 4-day history of burning with urination and a thick, purulent urethral discharge. He denies fever, chills, or flank pain. He is sexually active with multiple partners and inconsistently uses condoms. Past medical history is unremarkable. On exam, there is erythema around the urethral meatus with copious yellow discharge. No inguinal lymphadenopathy is noted. Urinalysis shows pyuria but no bacteria on standard culture. List 4 possible diagnosis for this patient.