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Representative PstI ribotypes obtained from a subset of 71 S. enterica serotype Typhi isolates under study. Ribotype numbering is indicated. The dendrograms generated by the BioNumerics software show the results of cluster analysis on the basis of PstI ribotyping. Similarity analysis was performed by using the Dice coefficient, and clustering was done by UPGMA. n, the number of isolates for each ribotype is indicated.
