[The antigenic relationships of Morganella].

Interspecies relationships in the genus Morganella have been studied in the agglutination and adsorption tests. New data on the antigenic relationships of O groups O43 and O49 and more precise data on the antigenic relationships of O groups O1 to O42 have been obtained. For the first time the relationships of antigens 40 and 42 with 4, 35 and 31, 38 and 39, 9 and 45, 1a, d and 49; 45 and 47, 24 and 45; 5, 23, 26 with 47; 1, 19, 46 with 41, 48 have been described and the complete identity of O antigens 33 and 35; 34 and 36; 40 and 42; 3, 13 and 17 has been established. These data must be taken into consideration in the preparation of polyvalent agglutinating sera, necessary for finding out the serological picture of Morganella isolated from patients and the environment.