■爱德华氏菌变异株C9605及对鳖的致病性研究

STUDIES ON EDWARDSIELLA ICTALURI VARIATION STRAIN (C9605) AND ITS PATHOGENICITY TO SDET-SHELL TURTLES

从患白板综合症的病鳖分离到一株细菌（C9605），该菌为革兰氏阴性，直杆状，周生鞭毛。接触酶阳性，氧化酶阴性，还原硝酸盐，对多粘菌素不敏感，不利用柠檬酸盐和丙二酸盐作唯一碳源，不从甘露醇、蔗糖、海藻糖、L-阿拉伯糖产酸。根据这些特性，菌株可归于爱德华氏菌。但是该菌发酵木糖产酸，产生H2S，耐青霉素，故鉴定为爱德华氏菌变异株（Edwardsiellaictalurivariationstrain）。人工感染实验证实，该菌株是鳖白板综合症的病原菌。

A strain C9605 was isotaled from the diseased Soft-shellturtles in Wangcheng county,Hunan province. The bacteria are Gram negative, straight rods, with peritrichous flaglla, catalase positive, Oxidase-negatire, reduce nitrate to nitive, resistant to colistin. Gitrate and mato nate are not utilized as sole source of carbon. They do not preduce acid from mannitol, sucrose,trehalose and L-arabinose. Based on the characterishcs, the strain C9605 could be included dwardsiella ictaluri, but since C9605 produce acid from xylose, produce hydrogen sulfide and resistand to pentcillinum, it was identified as Edwardsiella ictaluri Variation strain. The challenge fest showed that thise strain was the pathogenic bacteria of white abdomen syndrome in soft-shelled turtle.