166 PROTOZOAN PARASITISM 



fecal contamination. Dock (1894) found the or- 

 ganism in clumps of pus cells and epithelium in 

 freshly voided urine from a man on several occasions. 

 The writer has seen it once, in catheterized speci- 

 men, in the urine of a man, out of several thousand 

 examinations of the urine of men. Marchand ( 1894) , 

 Miura (1894), and Escomel (1927), have reported it 

 in the urine of men. It has been cultivated by the 

 writer, by Reuling (1921) (according to Hogue), by 

 Hegner (1928), and others. The writer has secured 

 prolific cultures in Hogue's ovo-mucoid medium. 

 Hegner (1928), who has studied the spontaneous 

 infection of the vagina of monkeys and has cultivated 

 trichomonads from the monkey's intestine and vagina 

 and produced experimental vaginal infection with 

 them, makes no mention of any abnormal state associ- 

 ated with its presence. He finds the two morphologi- 

 cally similar and from this and the experimental va- 

 ginal infection with the intestinal trichomonad thinks 

 they may be the same. 



Davis and Colwell (1929) consider Trichomoiias 

 vaginalis a very common parasite in women with ab- 

 normal vaginal discharges and believe it to be an 

 active factor in the production of vaginitis. They 

 cultivated it best in 5% human serum in dextrose 

 broth. 



TRANSMISSION, HABITAT AND EFFECTS 



The manner of transmission of Trichomonas va- 

 ginalis is unknown. Perhaps it may invade the 



