The lineage of 26 strains based on cluster analysis of RAPD bands,could be classified as 1 big group and the big group included 17 strains of Korea and 4 strains of USA.

• 聚类分析结果；相似系数为0.；92时；26个菌株分为两大组；一组由21个菌株组成；包括大部分韩国菌株和美国菌株;