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Comparative immunochemical studies of the surface antigens of Escherichia coli strains 08:K87(B?)H19 and (O32):K87(B?):H45.

The O-antigenic lipopolysaccharides and the acidic polysaccharides isolated from Escherichia coli strains O8:K87(B?):H45 were compared with respect to chemical composition and seroligical specificity. 
 
 
 
The O-specific polysaccharide moiety of the lipopolysaccharide from E. coli O8:K87(B?):H19 contains mannose as the sole sugar constituent, whereas the (O32)-specific polysaccharide moiety of the lipopolysaccharide from E. coli (O32):K87(B?):H45 consists of glucose, galactose, glucuronic acid, N-acetylglucosamine, and N-acetyl-l-fucosamine in the molar rations of 1:1:1:1:1. From both strains, an acidic polyaccharide can be isolated which consists of glucose, galactose, glucuronic acid, N-acetylglucosamine, and N-acetyl-l-fucosamine in the molar ratios of 1:1:1:1:1. Both acidic-polysaccharide preparations, as well as the (O32)-specific polyaccharide moiety of the lipopolyaccharide from E. coli (O32):K87(B?):H45, have the same structure and, upon partial acid hydrolysis, yield the same oligosaccharides. 
 
 
 
With the aid of bacterial agglutination, passive haemagglutination, and immune precipitation in homologous and absorbed immune sera, as well as inhibition studies of these reactions with oligosaccharides, serological identity of the acidic polysaccharide and the (O32)-specific polyaccharide moiety of the lipopolyaccharide from E. coli (O32):K87(B?):H45 was shown. 
 
 
 
It is concluded that the acidic polysaccharide, which has been shown to be the K antigen of E. coli O8:K87(B?):H19, is also responsible for O-specificity in strain (O32):K87(B?):H45.