FIG. 3.

Cluster analysis of composite RAPD fingerprints. Canine fecal and human clinical isolates are identified as to host (D, dog; H, human) and clinical source (B, bacteremia; CY, cystitis; F, fecal; NBM, neonatal bacterial meningitis). ECOR strains (shown in bold) are identified as to phylogenetic group. Dendrogram construction (by UPGMA) was based on composite RAPD fingerprints from primers 1247 (Fig. 2), 1254, and 1281. Clusters A, B, and C (brackets) correspond with the clonal groups shown in Table 2 and Fig. 2. The marker lane cluster (MW), which extends to the 92.3% similarity level (dashed line), reflects the variability inherent in gel electrophoresis and image analysis, exclusive of PCR-related artifacts.