猪链球菌分离株的病原学特性

Study on the Pathogen Characters of Streptococcus suis

从病死猪体内分离到3株链球菌,并进行了病原学鉴定。细菌在形态上呈链球菌的特征,β或α溶血,分离株的生化试验结果相似,且都不与A^G链球菌群特异性血清发生凝集。经PCR鉴定,结果表明,3株均为猪链球菌2型。动物试验结果表明,3分离株对小鼠的毒力较低,但能在接种细菌12~15 d后使小鼠发病致死。

3 pathogenic bacteria were isolated from dead pigs, the etiology of 3 isolates were studied. The morphological and cultural characters indicated that the isolates belonged to genus Streptococcus. The biochemistry characters of 3 isolates were similar, and 3 isolates couldn＇ t be agglutinated by the Lancefild group A - G latex diagnostic kit. Finally, the three isolates were Streptococcus suis type 2, it was identified by serotype-specific PCR. The isolate of Streptococcus suis type 2 could infect mouse to death 12 - 15 days after being inoculated, though the virulence was low.