PFGE patterns of chromosomal DNA restriction fragments from 25 nonduplicate clinical P. mirabilis isolates. Lanes: 1 to 7 and 14 to 20, clinical isolates of P. mirabilis that belonged to clone A; 21 and 23, clinical isolates of P. mirabilis that belonged to subclone B1; 22 and 24, clinical isolates of P. mirabilis that belonged to subclone B2;; 25, clinical isolates of P. mirabilis that belonged to clone C; and 8 to 13, PFGE typing of six normal P. mirabilis isolates from intestinal tract.