Salmonella (S.) Choleraesuis var. Kunzendorf is the major cause of swine salmonellosis in Poland. Eleven XbaI macrorestriction profiles and 3 ribotypes were noted amongst 36 isolates tested. Index of discrimination reached 0.88. Two clonal lineages were distinguished. One of the lines embraced the majority of 2000-2002 isolates showing over 80% genome similarity. The findings prove the clonal spread of the pathogen among swineherds in Poland.