FIG. 3.

PFGE patterns (after digestion with BssHII, SalI, or Spe1) of five isolates of L. pneumophila serogroup 1 obtained from patients with community-acquired LD. A dendrogram for patterns obtained with each enzyme is shown. The pedigree of each isolate as shown on the figure. Column 1 lists the source of the isolate (P, patient). Column 2 gives the year each isolate was recovered. Column 3 is the plasmid type (0, no plasmid). The bar at the bottom of the figure indicates the degree of genetic relatedness.