Properties of Bacteroides fragilis antigens with specificity B.

Five different serologically active preparations were extracted from Bacteroides ovatus ATCC 8483 strain. These substances and sixteen preparations of culture supernatants all giving a positive reaction with antiserum of serotype B were used as inhibitors in haemagglutination inhibition test. The results showed that substances obtained from the culture supernatants differ from endotoxin of Bacteroides ovatus ATCC 8483 serotype B.