副猪嗜血杆菌的分离与鉴定

从福建省龙岩市l例临床症状、病理剖检变化疑似副猪嗜血杆菌病的患病猪的关节液中分离到1株革兰氏染色阴性可疑菌株,经卫星现象、生化鉴定等实验室诊断,进一步以副猪嗜血杆菌的16S rRNA基因设计特异性引物进行PCR鉴定,确定该分离菌为副猪嗜血杆菌。药敏试验结果表明,分离株对环丙沙星、卡那霉素、强力霉素、氨苄西林、阿米卡星、庆大霉素药物敏感;对泰妙菌素、诺氟沙星有抵抗力。     

副猪嗜血杆菌黑龙江株的分离与鉴定

为确定黑龙江某猪场发病猪群的病原,本研究从疑似浆膜炎的病料中分离到一株革兰氏阴性细小杆菌,通过对其进行细菌形态学、培养特征、生化特性和16S rRNA基因PCR鉴定,结果表明该分离菌株为副猪嗜血杆菌(HLJ-1分离株)。16S rRNA基因序列分析结果显示:该分离菌株与参考株的基因同源性达99%;药敏试验结果表明HLJ-1分离株对头孢曲松、头孢噻肟等β-内酰胺类抗生素高度敏感;小白鼠致病性试验结果显示,该分离株具有较强致病性。     

副猪嗜血杆菌广东流行株的分离鉴定与基因分析

本研究从广东省各个地区送检病料中成功分离鉴定了4株副猪嗜血杆菌,并且针对副猪嗜血杆菌16S rRNA基因特异性进行PCR检测和基因测序同源性分析,通过GenBank联机比对分析,所分离的菌株与国内外菌株16S rRNA序列同源性在98.2%以上,分离菌株之间同源性在99.6%~100%之间,证明了所暴发的菌株是副猪嗜血杆菌。     

副猪嗜血杆菌江西株的分离鉴定及药敏试验

从江西省彭泽县某猪场出现咳嗽、呼吸困难、胸膜有化脓性纤维蛋白渗出物病变的病死猪中分离到4株革兰氏阴性细小杆菌,对其进行培养特性和生化特性鉴定;用副猪嗜血杆菌16S rRNA的特异性PCR引物,通过PCR技术可从分离菌中扩增出821 bp的特异基因片段,表明该分离菌株为副猪嗜血杆菌。药敏试验结果表明,4株分离菌对头孢唑啉高度敏感,对头孢哌酮、氯霉素等敏感,而对复方新诺明、青霉素G等有抵抗力。小白鼠攻毒试验结果显示4株分离株均有致病性。     

副猪嗜血杆菌的分离鉴定及16S rRNA序列分析

从云南某规模化养猪场病猪肺脏分离到1株革兰氏阴性小杆菌,经细菌生化鉴定、PCR鉴定和16S rRNA序列比对鉴定为副猪嗜血杆菌。抗生素药物敏感试验结果表明,分离菌株对四环素、红霉素、氯霉素、头孢噻吩高敏;对庆大霉素、氧氟沙星、诺氟沙星中敏;对磺胺甲唑耐药。16S rRNA分析结果表明,该分离株与GenBank中的Hps参考株AB078973(基因登录号)同源性为100%,将分离菌株鉴定为副猪嗜血杆菌。16S rRNA遗传进化关系表明,分离株与副猪嗜血杆菌3株血清5型参考株AB078972、AB078973、AB078974的16S rRNA序列位于一个分支上,遗传进化关系最近,它们之间的核苷酸同源性在99.0%~99.4%之间,初步鉴定为血清5型副猪嗜血杆菌,致病性试验结果表明,分离菌株对小白鼠有强致病性,命名为YN-1株。     

副猪嗜血杆菌Shandong2007株的分离与鉴定

对1例临床症状、病理剖检变化疑似副猪嗜血杆菌病的仔猪病料进行实验室诊断,进行了细菌形态观察、培养特性和生化特性等鉴定,根据副猪嗜血杆菌的16 S rRNA基因设计特异性引物进行PCR扩增,将822 bp片段连入T-载体后测序,再通过GenBank进行比对分析.生化试验结果为接触酶阳性,氧化酶和H2S阴性;生长需要NAD,发酵果糖、半乳糖和蔗糖等,不分解D-甘露醇和D-山梨醇.药敏试验显示,对氨苄青霉素、丁胺卡那霉素等药物敏感.PCR鉴定结果与国外副猪嗜血杆菌菌株16 S rRNA序列的同源性为99%以上,初步鉴定该分离菌株为副猪嗜血杆菌(Haemophilus parasuis,Hps).     

血清6型副猪嗜血杆菌的分离鉴定和生物学特性研究

为了明确河南地区血清6型副猪嗜血杆菌流行菌株的生物学特性,试验从发病猪的肺脏、心血、关节液等病料中分离、纯化副猪嗜血杆菌,并对分离纯化的副猪嗜血杆菌进行PCR鉴定,同时进行血清型分型、致病性试验、毒力基因检测和药敏试验。结果表明：从肺脏中分离得到一株血清6型副猪嗜血杆菌,该菌株携带有vta1、vta2、vta3、wza、ompP2、nanH、cdtA、cdtC、espP2 9种主要毒力基因;对保育仔猪表现出轻微的致病性;对头孢噻呋、头孢他啶、阿莫西林等16种抗生素敏感,对氨苄西林、青霉素G、卡那霉素等8种抗生素耐药。说明分离得到的血清6型副猪嗜血杆菌毒力较弱,对大多数药物敏感。     

多重感染猪场副猪嗜血杆菌的分离与鉴定

本文通过临床观察、病理解剖和PCR方法诊断某猪场暴发的疑似断奶后多系统消耗综合征（PMWS），同时分离到一株合并感染的病原菌。分离菌株经细菌培养特性、生化反应。16sRNA基因特异性片段PCR扩增产物的序列测定，鉴定为副猪嗜血杆菌。通过对玻板凝集试验抗体阴性猪的静脉攻毒试验，攻毒猪在11h死亡，表明分离茵属于强毒型嗜血杆菌。     

副猪嗜血杆菌的分离鉴定及其对小白鼠致病性试验

从江西省彭泽县某猪场出现咳嗽、呼吸困难、胸膜有化脓性纤维蛋白渗出物病变的病死猪中分离到1株革兰氏阴性细小杆菌,进行了培养特性和生化特性鉴定;用副猪嗜血杆菌16SrRNA的特异性PCR引物,通过PCR技术可从分离菌中扩增出822bp的特异基因片段,表明该分离菌为副猪嗜血杆菌。药敏试验结果表明,分离菌对头孢唑林高度敏感,对氟哌酸、头孢哌酮、氯霉素等敏感,而对复方新诺明、链霉素等有抵抗力。小白鼠攻毒试验显示其有致病性。     

副猪嗜血杆菌的分离鉴定和药敏试验研究

从山东某繁育猪场送检的疑似病例中分离到4株革兰氏阴性细小杆菌,通过培养特性试验和生化试验初步诊断为副猪嗜血杆菌,根据副猪嗜血杆菌16S rRNA序列设计引物,进行PCR鉴定,结果表明4株分离菌株为副猪嗜血杆菌.对4株分离菌株进行小白鼠毒力试验和药敏试验,结果表明,4株分离菌能致死小白鼠,对头孢他啶,头孢噻呋、氧氟沙星、多西环素、环丙沙星敏感,对土霉素、链霉素、林可霉素抵抗.     

副猪嗜血杆菌的分离鉴定与药敏试验

对广东15个送检的疑似猪传染性副猪嗜血杆菌病的病猪样品,用TSA培养基进行细菌的分离,并对分离菌株进行细菌的形态观察、培养特性和生化试验鉴定,以及用副猪嗜血杆菌16S rRNA基因的特异性引物进行PCR鉴定。试验结果表明,有7株分离菌株扩增出了821 bp的特异性目的条带,结合形态观察、培养特性和生化试验鉴定,结果表明成功分离到了7株副猪嗜血杆菌;药敏试验结果显示,分离菌株对氨苄西林、多粘菌素、庆大霉素等药物较敏感。     

Development of a PCR test to diagnose Haemophilus parasuis infections.

A polymerase chain reaction (PCR) test was developed in order to improve the accuracy and speed of diagnosis of Haemophilus parasuis, an economically important respiratory pathogen that affects swine. The gene sequence of the 16S small subunit ribosomal RNA of H. parasuis (GenBank M75065) was compared with 56 16S sequences of related bacteria, including those frequently isolated from pig tissues. Two species-specific primers were designed: HPS forward and HPS reverse. The predicted size of the amplified PCR product was 821 bp. The PCR test could detect a minimum of 102 bacteria and 0.69 pg of DNA. Thirty-one H. parasuis isolates, including 12 different serovars and 19 field isolates, were positive using the PCR test. No amplification was observed when the test was run using DNA from 15 other bacterial species commonly isolated from swine tissues. A weak band was observed when the PCR test was performed using Actinobacillus indolicus DNA as template. Clinical samples tested by PCR included tissues and swabs from 5 animals naturally infected with H. parasuis and 1 experimentally infected animal. The PCR was positive in 26 of 30 clinical samples. Four samples showed weak bands, and these results were not considered positive. Haemophilus parasuis was isolated from 18 of 30 of these samples. Tissues from specific pathogen-free (SPF) pigs and from unrelated species were negative for H. parasuis isolation and PCR. The developed PCR was successfully used in the diagnosis of H. parasuis infection, especially when compared with traditional microbiology techniques.     

First isolation of Haemophilus parasuis and other NAD-dependent Pasteurellaceae of swine from European wild boars

Haemophilus parasuis is a colonizer of the upper respiratory tract of pigs and the etiological agent of Gl?sser's disease, which is characterized by a fibrinous polyserositis, meningitis and arthritis. Gl?sser's disease has never been reported in wild boar (Sus scrofa), although antibodies against H. parasuis have been detected. The goal of this study was to confirm the presence of this bacterium in wild boar by bacterial isolation and to compare the strains to H. parasuis from domesticated pigs. Therefore, nasal swabs from 42 hunted wild boars were processed for bacterial isolation and subsequent H. parasuis identification by specific PCR, biochemical tests and 16S rRNA gene sequencing. Two different strains of H. parasuis from two wild boars were isolated. These strains belonged to serotype 2 and were included by 16S rRNA gene sequencing and MLST analysis in a cluster with other H. parasuis strains of nasal origin from domestic pigs. During this study, Actinobacillus minor and Actinobacillus indolicus, which are NAD-dependent Pasteurellaceae closely related to H. parasuis, were also isolated. Our results indicate similarities in the respiratory microbiota of wild boars and domestic pigs, and although H. parasuis was isolated from wild boars, more studies are needed to determine if this could be a source of H. parasuis infection for domestic pigs.     

Isolation and Identification of Haemophilus parasuisand Correlative Research

In 2013, nineteen small gram-negative bacilli were isolated from pigs with suspected infection of Haemophilus parasuis in Beijing. Isolates were identified as Haemophilus parasuis with the culture characteristics, capsule staining, biochemical method, serotype and PCR identification, and these strains belonged to 4, 5, 7, 12, 13 serotypes. The results of the drug sensitivity test and the pathogenicity test of the nineteen isolates showed that the isolates were multi-drug resistance, and all strains except GS-3 had strong toxicity.     

两株副猪嗜血杆菌的分离鉴定及药敏试验

从疑似副猪嗜血杆菌病发病猪场采集58份病料,分离到2株革兰氏阴性短小杆菌.对分离菌株进行培养特性、生化特性、血清型分型研究以及PCR检测和测序分析,结果表明,分离的两株细菌均为血清4型副猪嗜血杆菌.对分离菌株进行药敏试验分析,结果显示分离株对头孢噻肟、头孢噻吩、替米考星高度敏感,对四环素、丁胺卡那、恩诺沙星、环丙沙星中度敏感,对甲氧苄氨嘧啶、复方新诺明、链霉素、阿莫西林、新霉素均耐药.     

副猪嗜血杆菌血清型和外膜蛋白P5基因型多样性的研究

副猪嗜血杆菌(Haemophilus parasuis,Hps)的血清型及基因型具有复杂多样性。本研究用间接血凝试验对某一猪场分离的Hps进行血清分型鉴定,并对部分菌株的外膜蛋白P5基因进行克隆测序和进化发育分析。试验结果显示,在21头病死猪不同部位共分离了42株Hps,其中 Hps血清5型17株(40.7%)、血清14型12株(28.5%)、血清4型1株(2.3%)和未定型12株(28.5%)。本试验中有5头猪同时感染2种不同血清型的Hps。21株Hps临床分离株分属5个不同基因序列型(STA～STE),其中STA有12株(12/21)为优势基因型;相同血清型的Hps分离株具有不同的STs型,来自同一头猪的Hps血清型和STs型也不相同。以上结果表明,同一猪群感染的Hps血清型和基因型存在明显的多样性,同一头猪感染Hps的血清型和基因型也存在多样性。本研究为进一步揭示猪群感染Hps的复杂性,研究该病的感染与流行机制提供了有价值的参考。     

Analysis of Haemophilus parasuis isolates from southern Ontario swine by restriction endonuclease fingerprinting.

To study the occurrence and distribution of various strains of Haemophilus parasuis in southern Ontario swine, organisms isolated from healthy swine, from specific pathogen-free and conventional herds, and from disease cases were examined using restriction endonuclease fingerprinting analysis. In most herds, several strains of H. parasuis could be detected although one or two strains usually predominated. Individual animals were colonized by a single or limited number of strains. In several cases, the same strains were isolated from more than one specific pathogen-free herd. Conventional herds carried a more heterogeneous population of H. parasuis. Only one strain was isolated which was common to more than one conventional herd. No strains were isolated which were common to both specific pathogen-free and conventional herds. None of the strains isolated from disease cases were found in healthy conventional or specific pathogen-free swine examined in this study.