SUMMARY: From strains of representing each of the five serological groups and some ‘Rough’ forms, lipopolysaccharides were isolated after disintegration of acetone-dried saline extracted organisms with phenol. The materials appear to carry the specificities on which the serological classification of the species is based; they are relatively poor antigens when isolated but antigenicity can be enhanced by combining with lipoprotein. Analyses show some unusual features, an aldoheptose sugar being present in all of the materials and some of the ‘Smooth’ cell products contain dideoxy sugars; rhamnose is absent. The ‘Rough’ cell products are somewhat similar in composition to the ‘Rough’ somatic polysaccharide of , to which they are also related serologically.


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