Objective    To analyze the characteristics of isozymograms of Trichomonas vaginalis (TV) and Trichomonas tenax (TT) and their relation in an attempt to find the identification index of their isozymograms.     Methods    Five isozymes including melate dehydrogenase (MDH)

glutamic dehydrogenase (GLDH)

glucose-6-phosphate dehydrogenase (G6PD)

alcohol dehydrogenase (ADH) and catalase were stained with SDS-PAGE. Isozymograms of TV and TT were compared and analyzed.     Results    Two identical bands (Rm52 and Rm85) of MDH isozymogram and 4 bands (Rm34

Rm42

Rm94 and Rm100) of MDH isozymogram were found in TV and TT

respectively. No band and 6 band of GLDH isozymogram were identified in TV and TT

respectively. Three bands (Rm35

Rm42 and Rm52) of G6PD isozymogram were observed in TV

and more bands of G6PD isozymogram were demonstrated in TT

in addition to the 3 bands in TV. No band of ADH and catalase isozymogram was displayed in TV and TT.     Conclusion    MDH

GLDH and G6PD can be used as an identification index of TV and TT isozymograms.