FIG. 2.

Comparison of outbreak and sporadic isolates. Fingerprints of outbreak and unrelated sporadic isolates were obtained and compared as described in Materials and Methods. The size standard shown above the test fingerprints is Salmonella Braenderup strain H9812 digested with XbaI. The outbreak fingerprint of each serotype is enclosed in a box, and the fingerprints of the sporadic isolates of each serotype are shown below the outbreak fingerprint. A representative fingerprint is shown for each pattern; duplicate fingerprints were omitted. The number of isolates matching each outbreak pattern is summarized in Fig. 1.