[Antigenic study of Serratia marcescens isolated in France. I.--Antigens: individualization of six new H factors (author's transl)].

The H antigens of 469 strains of Serratia marcescens have been studied. A specific immobilization test in soft agar with antiserum is described. Being more quickly carried out than tube agglutination, it has the same specificity. The most frequently identified H antigen is H:12. Six new H antigens (H:14 to H:19) have been individualized, one of them--H:17--frequently occurring in strains isolated in France.