Lipopolysaccharides of Group F,a new group of vibrios

The sugar composition of the O-antigenic lipopolysaccharides isolated from Group F vibrios was analysed. 2-Keto-3-deoxy-octonate was totally absent from the lipopolysaccharides. As common component sugars, glucose, galactose, L-glycero-D-mannoheptose, and glucosamine were present. The Group F vibrios examined were found to be divided into two groups, designated tentatively as groups I and II, on the basis of the pattern of the sugar composition of their lipopolysaccharides. As additional sugar components, mannosamine, quinovosamine and two unidentified amino sugars, F1 and F2, were present in group I, while rhamnose, galactosamine, an unidentified amino sugar, F3, and a relatively high content of D-glycero-D-mannoheptose were found in group II.