猪源莫拉菌的分离鉴定与部分生物学特性分析

从病死仔猪心脏中分离到一株革兰阴性菌,对该细菌进行形态学观察、生化鉴定、16S rDNA序列测定,确认该菌为猪源莫拉菌属亚种,将该菌株命名为猪源莫拉菌-ZY20001。对菌株进行致病性试验、药敏试验和部分耐药基因的检测。结果显示,该菌引起小鼠胸腔积液,不致死,对红霉素、青霉素、多粘菌素等21种抗生素药物表现不同程度的敏感,对哌拉西林耐药。菌株ZY20001具有TEM型β-内酰胺酶耐药基因,表型与基因型不符。该实验可为深入研究莫拉菌的分类进化及药物治疗提供参考依据,同时对青霉素耐药表型与基因型关系所做的初步探讨也丰富了流行病学调查资料。

Identification and biological characteristics analysis of Moraxella from swine

A gram-negative bacterium was isolated from the heart of dead piglets, and morphological observation, biochemical identification and 16S rDNA sequence were performed. The strain was identified as Moraxella porci sp., which was named as Moraxella porci-ZY20001. The pathogenicity test, drug susceptibility test and partial resistance gene were detected in strain ZY20001. The results showed that the bacteria caused the pleural effusion in mice and showed varying degrees of sensitivity to erythromycin, penicillin, polymyxin and other antibiotics (a total of 21 kinds), except piperacillin. The strain ZY20001 had a TEM-type β-lactamase-resistant gene, and the phenotype was not consistent with the genotype. This study provided scientific reference for the further study of the evolution and drug therapy of Moraxella, and the analysis of relationship between penicillin resistance phenotype and genotype would enrich the epidemiological survey data.