Arcanobacterium haemolyticum strains used in this study.

1 Abbreviations: ATCC = American Type Culture Collection. S = smooth biotype (n = 36), R = rough biotype (n = 37). IS element refers to presence (Y, yes) or absence (N, no) of IS within aln coding region. C, ClaI site, X, XcmI site, N, neither ClaI nor XcmI sites.2 PC, Petteri Carlson isolates, Finland; PI, Peter C. Iwen isolates, United States (Nebraska); CL, Christoph Lämmler isolates, Germany and Denmark.3 Donkey isolate.4 Horse isolate.Arcanobacterium haemolyticum strains used in this study.