眼镜蛇中间克吕沃菌的分离鉴定及药敏试验

为了研究北京市昌平区蛇场眼镜蛇的死亡原因,对眼镜蛇进行剖检、病理组织观察、病原菌的分离培养、生化鉴定、16SrRNA PCR以及致病力试验,确定致病菌为中间克吕沃菌。药敏试验结果显示,该菌对阿米卡星、庆大霉素、亚胺培南、美洛培南、头孢他啶、头孢噻肟、头孢吡肟、氨曲南、阿莫西林/克拉维酸、哌拉西林/他唑巴坦、左氧沙星高度敏感,对氨苄西林、氨苄西林/舒巴坦、复方新诺明、氯霉素、四环素、哌拉西林耐药。试验结果可为眼镜蛇感染中间克吕沃菌的治疗提供依据。     

竹鼠绿脓杆菌的分离和鉴定

对广西某养殖户送检的病竹鼠进行病理剖检及细菌分离鉴定,根据发病临床症状,病理变化,病原分离鉴定及致病性试验结果,确诊为绿脓杆菌感染。对分离菌进行药敏试验,结果显示所分离到的绿脓杆菌细菌对氧氟沙星、诺氟沙星、环丙沙星、庆大霉素、阿米卡星和阿奇霉素敏感;对头孢他啶、头孢西丁、利福平和阿莫西林耐药。     

竹鼠绿脓杆菌的分离鉴定及耐药性分析

对广西某竹鼠养殖户送检的病竹鼠进行病理剖检及细菌分离鉴定,据临床发病症状、病理变化、病原分离鉴定及致病性试验结果,确诊为绿脓杆菌感染。动物致病力试验结果表明该分离株具有较强的致病力;对分离菌进行药敏试验,结果显示所分离到的绿脓杆菌对氧氟沙星、诺氟沙星、环丙沙星、庆大霉素、阿米卡星和阿奇霉素敏感,对头孢他啶、头孢西丁、利福平和阿莫西林耐药。     

一株鸭源大肠埃希菌强毒株的分离鉴定

为确定江西某养鸭场发病的病原和筛选敏感药物用于临床治疗,通过常规的细菌分离方法,从送检病死鸭的肝、心脏中分离细菌,并对分离菌进行培养特性、生化试验、动物致病性试验和耐药性分析.结果分离并鉴定到1株大肠埃希菌,该菌对小鼠和雏鸭有很强的致死性；药敏试验结果显示,分离的大肠埃希菌仅对头孢噻呋钠、阿莫西林/棒酸、奈替米星和红霉...     

副猪嗜血杆菌河南分离株的分离鉴定及药敏试验

通过对河南省某规模化猪场出现疑似副猪嗜血杆菌感染的病猪进行病理剖检,及细菌分离培养、生化鉴定和药敏试验。结果表明,分离到的致病菌经形态特征和生化反应鉴定,有3株为副猪嗜血杆菌。药敏试验显示3株分离菌对左旋氧氟沙星均高敏,对恩诺沙星、磺胺间甲氧嘧啶、氟苯尼考、头孢噻呋钠为高度或中度敏感,而对替米考星、阿莫西林、氨苄西林等有耐药性。     

雏鸡绿脓杆菌的分离鉴定及药敏试验

对河南省中牟县某养殖户送检的病鸡进行病理剖检及细菌分离鉴定,根据发病临床症状,病理变化及病原分离鉴定,确诊为绿脓杆菌感染。药敏试验结果显示,所分离的绿脓杆菌对庆大霉素、氧氟沙星高度敏感;对丁胺卡那、多黏菌素中度敏感;对阿莫西林、氨苄西林及强力霉素耐药。     

一株高致病性鸡伤寒沙门菌的分离与鉴定

对某蛋鸡场送检的10日龄左右病死雏鸡,进行了病理剖检,并开展了病原微生物分离培养、PCR鉴定、生化鉴定、血清学分型、动物回归、药物敏感性试验.结果显示,分离菌株为革兰氏阴性小杆菌,能够与鸡白痢鸡伤寒沙门菌阳性血清产生明显的凝集,PCR结果证实该分离株为鸡伤寒沙门菌;动物回归试验中,分离的鸡沙门菌具有较强的致病性;药物敏感性试验表明,分离株对替米考星、磷霉素、阿莫西林耐药,使用敏感药物氟苯尼考对鸡群沙门菌的控制取得了良好的治疗效果.     

蛇源奇异变形杆菌的分离鉴定及药敏试验

为了更好地了解广西蛇病的主要致病菌及其对现有药物的敏感性,无菌取发病眼镜蛇内脏器官,用鲜血琼脂、麦康凯培养基分离培养病原菌,分离到1株优势菌。对该菌进行生长形态特性观察、生化特性试验、16S rRNA基因序列分析、致病性试验和药敏试验。表明该分离菌为具有较强致病力的奇异变形杆菌,药敏试验结果表明分离病原菌对阿米卡星、氧氟沙星、诺氟沙星、环丙沙星、恩诺沙星敏感;对头孢他啶、头孢曲松、头孢西丁、多西环素、阿奇霉素、阿莫西林耐药。     

猪源鼠伤寒沙门菌的分离鉴定与耐药性分析

为确定江西2个规模养猪场患病死亡仔猪的病因,通过病理剖检、常规细菌学检查,从采集的病料中进行病原菌的分离鉴定,并利用动物试验和药敏试验,确定分离菌的致病性和敏感药物。结果表明,6株分离菌均符合鼠伤寒沙门菌的生物学特性,分离菌可在48h内致死小鼠,分离菌的耐药性较强,对阿米卡星、卡那霉素、头孢噻肟较敏感,对另外9种抗生素低敏或耐药。确定2个猪场仔猪发病的主要致病菌是鼠伤寒沙门菌。     

罗非鱼链球菌的分离鉴定及中草药药敏试验

为了对某养殖户发病的罗非鱼进行治疗,试验进行了病原菌的分离培养、生化鉴定及中药药敏试验。结果表明:从患病罗非鱼体内分离得到一株链状排列的革兰氏阳性球菌,经生理生化鉴定为无乳链球菌,回归试验证明该菌对罗非鱼有较强的致病性。药敏试验结果显示,该菌对苏木、石榴皮、五倍子、黄连、桉树叶、沙棘和乌梅高度敏感,对大黄、黄柏中度敏感。     

一株山羊源杀鲑气单胞菌的分离、鉴定及药物敏感性检测

对患呼吸系统疾病的病羊进行病原的分离,并对分离菌进行形态观察、致病性试验、16Sr DNA基因序列的测定及药敏试验。结果显示,分离菌对健康Balb/c小鼠具有较强的致病性,其引发小鼠的病理变化与临床剖检患病山羊的病理变化相同,均为急性间质性肺炎。16Sr DNA基因序列测定结果表明其与杀鲑气单胞菌的16Sr DNA基因序列一致性为98%,该菌株仅对头孢噻肟、强力霉素等药物敏感,对氧氟沙星、氟苯尼考、庆大霉素、环丙沙星、恩诺沙星、丁胺卡那霉素、大观霉素、诺氟沙星、克林霉素、氨苄西林、阿莫西林等临床常用药物均呈不同程度的耐药性。     

大熊猫源肺炎双球菌的分离鉴定

为了分析、丰富表现呼吸道症状的患病大熊猫的病原病因学,选用有效药物预防控制该类疾病,试验对从中国大熊猫保护中心采集的患病大熊猫鼻腔拭子进行了细菌培养、菌落形态学观察、生化试验、溶血试验和动物致病性试验。结果表明:分离到致病性肺炎双球菌;分离菌对万古霉素、青霉素、氨苄西林、红霉素、羧苄青霉素和阿莫西林等高度敏感,对丙氟哌酸、卡那霉素、四环素等中度敏感,对链霉素、强力霉素等药物有耐药性。     

互助藏羊梭菌病病原体的分离鉴定与分析

青海省互助县某羊场藏系绵羊患病死亡,伴有腹泻、神经症状,为快速确诊发病原因,及时防控和治疗,采集病羊样品5份,通过镜检、细菌分离培养、分子生物学试验及致病性试验进行病原鉴定分析。结果证明此次病原菌为羊致病性D型魏氏梭菌,毒素基因分析显示该菌同时含有α和ε两种毒素基因,动物致病性试验结果表明该菌对昆明系小鼠具有较强的致病性,并从试验致死的小鼠中分离到与藏羊病原相一致的细菌。三种基因的遗传进化树显示,该菌具有较强的多样性。研究确定了本次藏羊致死的主要病原为D型魏氏梭菌,结果可为该羊场梭菌病的治疗和预防提供科学依据。     

乳房炎牛乳中少动鞘氨醇单胞菌的分离鉴定和药敏试验

为了对陕西省某奶牛养殖场出现乳房炎的病例进行确诊,无菌采集患病奶牛的乳汁对其进行细菌分离、培养特性观察、生化试验、16S rRNA基因测序、动物致病性试验以及药敏试验。结果表明,分离到的细菌,其培养特性和生化试验结果与少动鞘氨醇单胞菌相吻合;16S rRNA基因测序结果与少动鞘氨醇单胞菌的同源性为98%;小鼠致病性试验表明该菌株有致病性;药敏试验结果表明,该菌对环丙沙星、诺氟沙星、复方新诺明等耐药,对多黏菌素、阿米卡星、亚胺培南、庆大霉素、头孢曲松等敏感。     

Isolation,Identification, 16S rRNA Gene Sequencing and Genetic Evolution Analysis of Aeromonas aeruginosa from Duck

【Objective】 The experiment was aimed to study the pathogenic bacteria of acute death of ducklings in a duck farm in Henan province and its phylogenetic status.【Method】 The liver and spleen of dead ducks in the diseased duck farm were collected.The bacterial morphology, Gram-staining, biochemical characteristics, sequence analysis of 16S rRNA gene, drug sensitivity test and pathogenicity test were carried out.【Results】 The isolated bacteria grew on blood agar medium with smooth, convex, milky white and α-hemolytic Gram-positive cocci.Biochemical test results showed that the isolated bacteria were positive for maltose, sucrose, raffinose, nitrate reduction reaction, MP-VP test, urea, lysine decarboxylase, ornithine decarboxylase and aescin, and negative for xylose, lactose, glucose, sorbitol, hydrogen sulfide, citrate, peptone, mannitol, phenylalanine and methyl red.The results of 16S rRNA gene sequencing and BLAST comparison results showed that the 16S rRNA gene sequence of the isolated strain was 94.8%-99.9% similar to that of Aerococcus viridans published on NCBI, and the similarity with strains Mnlv1, Mnlv2 and W66 was the highest, up to 99.9%.The similarity with strain GXBl-1 was the lowest, which was 94.8%.Phylogenetic tree analysis showed that the isolated bacteria belonged to the same genus and group on the same branch as strains of Aerococcus viridans FL09, 15MS and Mnlv2 etc., and had the closest genetic relationship with FL09.The results of drug sensitivity showed that the isolated strain was sensitive to fosfomycin, ampicillin and amoxicillin, moderately sensitive to penicillin, neomycin and amikacin, it was resistant to rifampicin, neomycin, bacitracin, erythromycin and enrofloxacin.The results of pathogenicity test showed that the strain was lethal and increased with the increase of inoculation concentration.【Conclusion】 This study determined that the pathogen causing the acute death of ducklings in a duck farm in Henan province was Aerococcus viridans, which provided a reference basis for clinical diagnosis and treatment of the diseases caused by this bacteria.     

Isolation of pathogenic aerobic bacteria from the blood of septicaemic neonatal calves and the susceptibility of isolates to various antibiotics

An automated blood culture system (BACTEC 9240) was used for the isolation of aerobic bacteria from the blood of septicaemic neonatal calves. Blood samples were collected from 90 clinically septicaemic and 20 healthy neonatal calves and inoculated into blood culture bottles. There were 89 significant isolates from 90 positive blood cultures using the BACTEC system. Escherichia coli was the most common pathogen detected accounting for 56 (63%) out of 89 isolates. The other pathogens were beta-haemolytic streptococci (15.7%), Staphylococcus aureus (10.1%), Klebsiella sp. (5.6%) and Corynebacterium sp. (5.6%). All isolates showed a susceptibility rate of 100% to enrofloxacin, cefepim, cefoperazone/sulbactam, imipenem and meropenem while some of them were ranged from 75 to 91.7% susceptible to amoxicillin/clavulanic acid, ampicillin/sulbactam, gentamicin and cephalosporins.     

Isolation,Identification and Pathogenicity of Aeromonas veronii from Lepidorthosis Pathogenic Bacteria of Tilapia

In order to study the pathogenicity of the pathogenic bacteria in the vertical scale disease of Tilapia,one strain of pathogenic bacteria was isolated from different parts of the diseased Tilapia,named as GXKJDX01.Then the methods of 16S rDNA gene sequence analysis,bacterial morphology observation,physiological and biochemical identification,drug sensitivity test and artificial infection test were used.The results showed that the pathogenic strain GXKJDX01 was Aeromonas veronii,strain GXKJDX01 was not sensitive to 5 medicines,including penicillin G,erythromycin,vancomycin,and had a strong pathogenic effect in yellow-head catfish meat,Tilapia,loach and Procypris merus.11 kinds of drugs,including of enrofloxacin,levofloxacin,ceftriaxone,could be effective to the prevention and control.This study is the first report on the case of the pathogenic bacteria of the lepidorthosis,which was the Aeromonas veronii,and the theoretical basis was provided for the effective prevention and control.     

罗非鱼竖鳞病病原维氏气单胞菌的分离鉴定与致病性研究

为研究罗非鱼竖鳞病病原菌的致病性,本试验从出现竖鳞症状的患病罗非鱼不同部位分离得到1株病原菌,命名为GXKJDX01,采用16S rDNA基因序列分析、细菌的形态学观察、生理生化鉴定、药敏试验和人工感染试验的方法对其研究。结果显示,致病菌株GXKJDX01为维氏气单胞菌（Aeromonas veronii）;该菌株对青霉素G、红霉素、万古霉素等5种药物有高度的耐药性;对罗非鱼、黄颡鱼、泥鳅和禾花鲤均有较强的致病性。使用恩诺沙星、左氧沙星、头孢曲松等11种药物可有效对其进行防制。本试验首次报道维氏气单胞菌作为竖鳞病的案例,为其有效防控提供理论依据。