FIG. 2.

Dendrogram obtained from cluster analysis of EcoRI ribotype profiles among 117 S. suis isolates. The isolates included strains from pigs with different clinical infections from 1967 to 1982 and 1995 to 1997, strains isolated from humans from 1960 to 1989, and avirulent strains. Ribotype nos. corresponds to the respective ribotype profiles given in the legend to Fig. 1, and the remaining ribotype profiles (ss02 and 89-1591) are the ribotypes profiles observed only once. The antimicrobial resistance expressed by more than 50% of the strains in a group are mentioned. Abbreviations: Tet, tetracycline; Sulfa, sulfamethoxazole. *, avirulent isolate. (The correlation is by number of bands, using Jaccard coefficients with a maximum tolerance of 0.8% and a minimum surface of 0.0%. A total of 4 to 396 zones were used. Clustering was done by the unweighted pair group method with arithmetic means.