DNA fingerprint tree topology of 30 clusters representing 361 ETEC strains isolated from young children in Guinea-Bissau. The toxin profile shows enterotoxins that were represented by most of the strains in the cluster. OR, odds ratio for diarrhea from infection, as estimated from logistic regression models, adjusted for age and season, and corrected for repeated measurements; CI, confidence interval; D/I, number of children with diarrhea/total number of infections.