Answer: Flagellate protozoa, consistent with Trichomonas vaginalis or Pentatrichomonas hominis (a closely related GI commensal). The history of chronic prostatitis and location of the organism in prostatic secretions is most consistent with infection with the T. vaginalis, and this diagnosis was later confirmed by making permanently mounted and stained preparations of the organisms.
On wet prep, both organisms demonstrate a characteristic 'jerky' non-directional motility, which can be observed in the videos from this case. P. hominis trophozoites have similar morphology to those of T. vaginalis, but are typically smaller and the flagellum that forms the outer edge of the undulating membrane continues past the posterior end of the trophozoite as a free flagellum.
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