Representative PFGE fingerprint patterns of S. suis strains after ApaI digestion. Lanes 1 and 11, bacteriophage lambda ladder PFGE marker (Boehringer Mannheim); lane 2, S. suis isolate B194-31-01 (pattern 15); lane 3, S. suis isolate L215-71-01 (pattern 38); lane 4, S. suis isolate L83-1-99 (pattern 1); lane 5, S. suis isolate L160-45-00 (pattern 36); lane 6, S. suis isolate B125-13-99 (pattern 21); lane 7, S. suis isolate L282-4-01 (pattern 22); lane 8, S. suis isolate B78-72-99 (pattern 17); lane 9, S. suis isolate L47-66-99 (pattern 10); lane 10, S. suis isolate B19-19-99 (pattern 30).