Enterotoxigenic Bacteroides fragilis isolated from nondiarrheic adults.

From 220 fecal samples of nondiarrheic adults, 29 strains of Bacteroides fragilis were isolated. Nine percent of them were enterotoxigenic Bacteroides fragilis (ETBF) strains. That is the first isolation of ETBF strains from nondiarrheic adults in Poland. Isolated ETBT strains could not be distinguished from non-enterotoxigenic Bacteroides fragilis (NTBF) strains by means of agglutination test. The sensitivity to antimicrobial agents does not differentiate enterotoxigenic from nonenterotoxigenic B. fragilis strains.