I was recently diagnosed with epididymitis. This was one via physical examination and an ultrasound. I had awoken that morning to a slight swelling of the right epididymis and sensation in my right testicle that I would not consider painful. My main concern and cause of anxiety is could this have been caused by an STI? My only sexual encounter was 4 months previous in which I received unprotected oral sex. I had no symptoms until the epididymitis, or if I did there were so minor I did not notice. Is it likely that this epididymitis was caused by this oral encounter. I have read throat chlamydia is rare, and that transferring to a penis is even more unusual, but I still concerned this could be the cause. I was given 10 days worth of Levofloxacin to take that seemed to have cleared it up. My urine was dipped and reported to have no elevated WBC. It was also sent out for a standard culture and came back negative. I do know however, this is not considered a good test for Chlamydia. I'm just looking for a little insight if anyone can help.