Southern blot of Xho -I digested DNAs from different A. salmonicida strains hybridized with an IS 630 -specific probe. Lanes 1 and 16, molecular size marker (sizes are indicated on the left in kilobase pairs); lanes 2 to 5 and 11, A. salmonicida subsp. salmonicida (JF2267, JF3224, JF3996, JF3507, JF3121 [formerly identified as atypical]); lanes 6 to 8 and 13, A. salmonicida subsp. achromogenes (JF3115, JF3116, JF2997, JF3123 [formerly identified as atypical]); lane 9, A. salmonicida subsp. pectinolytica (JF3120); lane 10, A. salmonicida subsp. masoucida (JF3118); lanes 12, 14 and 15, A. salmonicida atypical (JF3122, JF3124, JF3125).