FIG. 1.
Genetic diversity between the two common pentaresistant MDR Salmonella serovar Typhimurium phenotypes based on AFLP fingerprinting. Two major clusters are shown: cluster 1, the AmKmStSuTe resistance phenotype cluster (with three subclusters, subclusters 1A to 1C); and cluster 2, the DT104 cluster (with five subclusters, subclusters 2A to 2E). ∗, isolates collected from environmental samples (drag swabs); §, isolates in cluster 1 that encode β-lactam resistance using blaPSE-1; the remainder of the isolates with ampicillin resistance in cluster 1 carry blaTEM; ¶, isolates in cluster 2 carrying blaTEM; the remainder of the isolates with ampicillin resistance in cluster 2 carry blaPSE-1.