[Parathyphoid B-antigen containing a complex of protective surface antigens].

The authors obtained a complex antigen from paratyphoid B bacilli containing complete O-, K- and H-antigens. The preparation was nontoxic and was characterised by marked antigenic properties. In intravenous and oral administration it stimulated production of specific O-, K-, and H-antibodies in high titres. Complex paratyphoid B antigen possessed a marked protective activity and provided intense immunity in subcutaneous and oral administration to experimental animals.