Inflammation of seminal vesicles, glands which contribute to semen manufacture. Usually bacterial. Other use: Tetragenus.Encyclopedia Entry for Seminal Vesiculitis :Seminal Vesiculitis. Inflammation of seminal vesicles, glands which contribute to semen manufacture. Usually bacterial. Can be caused by Gonococco, Streptococco, Enterococco, Trichonomas.Information from Marcello Allegretti.