“…By use of 37 different phages, serotype Typhimurium can be divided in more than 210 phage types (1). Besides serotyping and phage typing, powerful bacterial molecular typing methods, such as plasmid profiling, pulsed-field gel electrophoresis (PFGE), IS200 typing, ribotyping, random amplified polymorphic DNA analysis, and amplified fragment length polymorphism, are used for epidemiological investigation of salmonellae (3,7,8,13,16). These techniques are useful for defining clonal relationships between strains (17) and for assessing the distribution of Salmonella strains within food-processing environments (10,15).…”