Depending on the expression of these extracellular components of Salmonella and other Enerobacteriaceae, they can display four morphotypes on indicator agar plates supplemented with Congo red and Coomassie brilliant blue. The curli and cellulose positive phenotype can be identifi ed as violet to red, dry and rough (rdar). Cells lacking synthesis of cellulose will appear brown, dry and rough (bdar). However, if there is cellulose but no curli fi mbriae, then the colony will appear pink, dry and rough (pdar). Phenotype isolates that do not express any of these two components form colonies which appear smooth and white (saw) [20,23]. Previous studies have indicated that Salmonella matrix components, such as curli fi mbriae and cellulose i.e. rdar morphotype, play an important role in the survival of Salmonella in the environment