PFGE analysis of C. jejuni isolates from different sources using SmaI (A) or KpnI (B). The isolates were FDA 17848 and FDA 17817 (lanes 1 and 2; from human), FDA N337 and FDA N342 (lanes 3 and 4; from chicken), clone SA subtype I (IA5908; lane 5) and subtype II (IA3902; lane 6), a goat abortion isolate (IA625; lane 7), and C. jejuni NCTC 11168 (lane 8). M, size marker (Salmonella sp. strain Braenderup H9812 genomic DNA digested with XbaI).