CFT), immunodiffusion according to OUCHTERLONY (8) and immunoelectrophoresis according to GRABAR (3) as modified by SCHEIDEGGER (1 1).Strains of the 6 groups of Yersinia enterocolitica'), the 5 ty es of Yersiwere used. The lipopolysaccharide-protein antigen fractions (LPA) prepared by the methods described by REDFEARN (9) and by us (2), GRASSET lysates and 0-suspensions of the bacterial strains served as antigens.Antisera to the bacterial lysates, LPA, 0-antigenic suspensions and to cow plasma proteins were prepared by hyperimmunizing rabbits with the corresponding antigens in FREUND'S adjuvant. nia pseudotuberculosis, of Br. melitensis and of Br. ovis, is0 P ated by us,
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