Ten different serogroups of Shigella dysenteriae were typed with the aid of lectins of known sugar specificity resulting from their interactions with the carbohydrates on lipopolysaccharides in the outer membrane of bacteria as evidenced by the agglutination-inhibition assay with simple carbohydrates. Lipopolysaccharides of two serogroups of Shigella were precipitated with different lectins and the results were corroborated by those derived from the agglutination assay suggesting that Shigella dysenteriae can be characterized on the species level with the aid of lectins.