Abstract
Isolated segments of colon in 5 monkeys (M. mulatta) were inoculated with a strain of Bact. dysenteriae (Flexner). An infection was produced in 2 monkeys with isolated pouches composed of cecum, ascending colon and part of the transverse colon. Oral administration of 1 gm. of sulfanilylguanidine daily for 6 days did not shorten the course of the disease in the 2 monkeys, although the organisms were not recovered after the drug was administered. In the 3 monkeys with isolated segments of transverse colon no dysentery was produced. One of these monkeys developed intermittent loose stools over a period of 2 months following the experiments and in 1 out of 6 trials Bact. dysenteriae was cultured. When sulfanilylguanidine was placed in the isolated segments of bowel there was a decrease in the number of gram-negative bacteria and an increase in the gram-positive organisms.