Trichomonas vaginalis parasitizes in human genitourinary tract.The protozoon adhering to target cell plays a critical role in its contact-dependent cytotoxicity.The enzymes synthesized by T.vaginalis can hurt vaginalis epithelial cells(VECs)directly.The focal immune reaction in the location parasitized by the parasite may provide an immunologic protection.Meanwhile,inflammatory factors and immune cells may aggravate the situation.In general,the T.vaginalis-induced contact-dependent cytotoxicity is a result of the involvement of some molecular and chemical factors.

Objective To Investigation the quality of marrow smear purchased by CDUTCM.Methods The quality and the typ-icality of marrow smears purchased during 2015 -2016 were collectively examined,and then decided whether these smears fit the blood cell morphology experimental teaching requirement.Results Of all the 960 marrow smears purchased these two years, 49.7% failed in smear made or stained,and 16.0% failed to meet the teaching requirements in the typicality of marrow cells.Con-clusion Teaching marrow smears,being different from clinic ones in their preparation and morphological diagnosis,must be of great quality in sustaining and of better typicality in their cell features.