Antigenic structure of Shigella flexneri 1b serotype, its antigenic 3b mutant and their susceptibility to bacterial action of complement of normal bovine serum
The susceptibility of S. flexneri 1b and 3b strains to killing action of serum was investigated. Differences in sensitivity to bactericidal action of complement appeared to result from different structure of their LPS-es. The protective effect of LPS-es depends both on their origin and concentration.