FIG. 1.

Dendrogram of PFGE profiles of Salmonella recovered from swine feed and fecal samples and their association with sources (farm, production stage, and replicate), serogroups, and antimicrobial resistance patterns. The following are terms used in the dendrogram: system, swine production system (three vertically integrated production systems were included in the study, production systems 1, 2, and 3); farm, symbols FF, TE, and RW are used to represent farm names; stage, stage of production (F1, early finishing stage; F2, late finishing stage [market age]).