Phenotypic expression of type 1 fimbriae in S . Typhimurium analyzed by yeast agglutination test. S. Typhimurium LB5010 prepared from broth medium exhibited positive agglutination phenotype, while those prepared from agar medium showed homogenous appearance on the glass slide. Δstm0551 strain, prepared from either agar or broth medium, both demonstrated agglutination. Transforming pSTM0551 into Δstm0551 inhibited agglutination. The transformants possessing either pSTM0551E49A or pACYC184 cloning vector exhibited the same agglutination phenotype as Δstm0551 strain.