Metronidazole (8823 RP; "Flagyl") is a nitroinidazole derivative which has been shewn to be highly active against T. vaginalis, not only in the laboratory (Cosar and Julou, 1959) but also in vivo against human trichomoniasis in the female (Durel, Roiron, Siboulet, and Borel, 1959, 1960; Durel, Couture, Collart, and Girot, 1960; Nicol, Barrow, and Redmond, 1960; Rodin, King, Nicol, and Barrow, 1...