Both Trichomonas tenax and Pentatrichomonas hominis normally receive only brief mention in medical texts—they are of doubtful patho-genicity and therefore little studied, so there is not much to say. Dientamoeba fragilis is rather better known, as many people regard it as a genuine, if far from invariable, pathogen—but again, it attracts far less interest than, say, Entamoeba histolytica.
The same pattern will also be found true of this review. However, for the late Professor Honigberg, any trichomonad was of absorbing interest and any reader wanting to know much, much more about one of these three organisms can be confidently referred to the relevant chapters of the monograph which he edited (Honigberg, 1989; Ockert, 1989).
TRICHOMONAS TENAX (O. F. MULLER)
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