其质粒图谱类型与菌株的来源有关。
The correlation of plasmid type and isolated place of strains were analysized.
方法：采用间接免疫荧光法、小鼠保护试验以及SDS -聚丙烯胺电泳法，分别测定分离株的血清类型、毒力和蛋白图谱。
Method: Use the method of indirect immunofluorescence, mice cross protection test and SDS -page to determine the serum type, the toxicity and the protein atlas of the isolated strains.
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