一株罗非鱼无乳链球菌的分离鉴定及药敏试验

为确定东莞市某养殖场罗非鱼发病的原因,有针对性制定防治措施,采集发病罗非鱼的脑、肝脏、脾脏、肾脏等组织样品进行细菌分离培养鉴定,通过VITEK-2 Compact进行生化鉴定和16S rRNA基因序列分析以及系统进化树构建,并对分离菌株(DG210721)进行药敏试验.结果显示:分离纯化培养的菌株特征、形态和生化鉴定结...     

猪链球菌广东株的分离鉴定及药敏试验

对来自广东韶关某猪场的疑似猪链球菌病病料进行分离鉴定,共分离到3株链球菌,对这3株链球菌进行了形态学观察、生化试验、16 S rRNA基因序列分析、猪链球菌2型的毒力基因检测及药敏试验。结果表明,其形态、染色、生化特性均符合猪链球茵的特点,测序后Blast同源性分析,证实3株菌株均为猪链球菌,用猪链球菌2型Cps2J引物进行PCR扩增,获得预期的459bp大小的目的片段。药敏试验结果表明,该菌对3种常用抗生素表现出敏感,对21种常用抗生素表现出耐药。     

1株猪源绿色气球菌的分离鉴定

从1头大约克病死猪病料中分离得到1株革兰阳性球菌,通过对其进行细菌形态学、培养特性、生化特性和分子生物学鉴定,确认分离得到的菌株为绿色气球菌。16S rRNA基因序列分析显示:该分离菌株与已知的绿色气球菌相应序列的同源性为100%;药敏试验显示分离株对β-内酰胺类抗生素有较好的敏感性。     

岩羊多动物链球菌分离鉴定及药酶试验研究

试验对祁连县境内未知原因死亡岩羊组织病料进行细菌学检测,通过细菌分离纯化、16S rRNA测序鉴定,并对分离细菌进行药敏试验分析.结果 表明:分离得到一株多动物链球菌(S1);分离株细菌S1的16S rRNA基因序列在线Blast分析显示,16S rRNA基因序列与GenBank上已登录(AccessionNo:NR1...     

鸽源大肠杆菌的分离鉴定与药敏试验

本试验为确定鸽场发病病原,对病死鸽子进行细菌分离,并通过常规鉴定细菌方法以及结合16S rRNA基因核苷酸序列测定等对分离菌进行鉴定。从病死鸽子的肝脏和肺脏中分离出大肠杆菌。分离菌对试验动物小白鼠有很强的致病性。药敏试验结果表明,分离菌对氟苯尼考等较为敏感,对阿米卡星等其他20种药物低敏甚至不敏感。     

猪链球菌的分离、16S rRNA鉴定及药敏试验

从湖南某猪场病猪组织中分离出6株细菌,通过培养形态、菌落特征、细菌染色特性、镜检、16S rRNA基因扩增及序列BLAST分析等系统鉴定,确定为猪链球菌,6株分离菌的16S rRNA基因序列与收录菌株同源性为99%以上。药物敏感性试验结果表明,分离细菌对头孢喹肟、先锋霉素、青霉素药物高度敏感。     

致乌苏里母貉腹泻性疾病病原的检测分析

为了鉴定乌苏里母貉腹泻性疾病病原,采集患腹泻母貉的肛拭子及粪便样品,通过胶体金试纸条、卵囊分离法、PCR法和细菌分离鉴定等方法对采集的病料进行病原检测。结果显示,犬瘟热病毒、细小病毒、冠状病毒抗原检测为阴性,分离鉴定的病原为钩口线虫和大肠杆菌,通过致病性试验验证其致病性,分离的大肠杆菌对小白鼠具有很强的致病性。引起貉腹泻的病原为钩口线虫和大肠杆菌混合感染,且分离的致病性大肠杆菌对头孢曲松、头孢噻呋、美罗培南、左氧氟沙星4种药物敏感,其他的药物具有不同的耐药性。为貉腹泻病的防控提供研究基础。     

羊源屎肠球菌的分离鉴定与生物学特性研究

某养殖场羔羊突然死亡,为了查明死亡原因,采集病死羔羊病变肺脏等进行细菌的分离培养,分离到1株革兰阳性、短链状排列的球菌,在血琼脂培养基上呈β溶血。通过对该菌的16S r RNA进行扩增和序列分析,其与屎肠球菌的同源性高达99%,应用通用引物对16S～23S rRNA的序列进行PCR扩增产生2个条带,分别为522 bp和619 bp。用Vitek 2全自动微生物分析仪鉴定为屎肠球菌,可能性为98%。该菌对万古霉素和米诺环素敏感,对青霉素、庆大霉素等药物表现耐药。结果显示,分离到的细菌为屎肠球菌,且该菌具有多重耐药性,本实验为兽医临床肠球菌的分离和鉴定提供了参考。     

狐源犬链球菌的分离鉴定

对40余份送检狐狸病料进行细菌分离,采用16S rRNA基因测序和生化试验进行鉴定,并进行细菌耐药性和致病性试验。结果显示:在病料中分离到5株革兰阳性球菌,综合鉴定为犬链球菌;该菌对氨苄西林、氯霉素、环丙沙星等药物敏感,但是对四环素有较强的耐药性;小鼠致病性试验显示该菌犬链球菌QL001的半数致死量为5×10~6cfu,有较强的致病性。研究结果为狐狸链球菌病的防控奠定了基础。     

Multiplex PCR-based identification of Streptococcus canis,Streptococcus zooepidemicus and Streptococcus dysgalactiae subspecies from dogs

Streptococcus canis (S. canis), Streptococcus equi subspecies zooepidemicus (S. zooepidemicus) and Streptococcus dysgalactiae subspecies (S. dysgalactiae subspecies) are β-haemolytic Gram positive bacteria infecting animals and humans. S. canis and S. zooepidemicus are considered as two of the major zoonotic species of Streptococcus, while more research is needed on S. dysgalactiae subspecies bacteria. In this work, a multiplex-PCR protocol was tested on strains and clinical samples to detect S. canis, S. dysgalactiae subspecies and S. equi subspecies bacteria in dogs. All strains were correctly identified as S. canis, S. equi subspecies or S. dysgalactiae subspecies by the multiplex-PCR. The main Streptococcus species isolated from symptomatic dogs were confirmed S. canis. The multiplex-PCR protocol described is a rapid, accurate and efficient method for identifying S. canis, S. equi subspecies and S. dysgalactiae subspecies in dogs and could be used for diagnostic purposes and for epidemiological studies.     

Contamination of dog hair with eggs of Toxocara canis

Toxocara canis, the common intestinal nematode of dogs and foxes, is the parasite responsible for human toxocarosis. It has recently been shown that dogs may harbour eggs of the parasite in their fur. To further investigate this claim a population of 100 stray dogs was examined to establish the prevalence and intensity of adult toxocaral worm infection in the intestines and eggs harboured in the hair. A novel method of washing the eggs from the hair was used. Sixty-seven percent of dogs were found to have T. canis eggs on their hair with a mean egg retrieval of nearly 584 eggs per gram from positive dogs. The age of the dog was found to be the only significant factor to influence the prevalence and intensity of eggs, with 95% of all the eggs recovered found on puppies. Thirty-nine percent of dogs were found to have adult T. canis worms in their intestine, although a significantly higher percentage of puppies (80%) were infected with worms than adults (22.5%). Puppies also had more worms per infection than adults and have a strong positive correlation between egg and worms numbers whereas adults did not. These studies show that stray dogs, particularly puppies, potentially harbour considerable numbers of eggs on their hair, at densities far higher than those reported in the soil or the general environment.     

Orbital cellulitis associated with Toxocara canis in a dog

Reports of Toxocara canis ocular larva migrans are uncommon in animals, with only a few cases reported. Most reports involve larval migration into the retina and choroid, with parasitic invasion of the orbit reported only in experimental studies. This is the first clinical case of Toxocara canis infection in the retrobulbar region of a 10-year-old, cross-bred male dog presenting with unilateral orbital cellulitis. Ophthalmic signs included protrusion of the nictitating membrane, chemosis, exophthalmos and hypertropia. The parasite was diagnosed by histologic and parasitologic examination of orbital tissues, which were removed during enucleation.     

Virulence of Streptococcus canis from canine streptococcal toxic shock syndrome and necrotizing fasciitis

The recent recognition of streptococcal toxic shock syndrome (STSS) and necrotizing fasciitis (NF) in dogs caused by Streptococcus canis highlights our lack of knowledge regarding the mechanisms of virulence of this organism. Fifteen isolates of S. canis from cases of canine STSS and/or NF were examined for the presence of 10 Streptococcus pyogenes-associated virulence genes by Southern hybridizations using gene probes generated by PCR. The isolates lacked DNA with homology to eight of the 10 gene probes (speA, speB, speC, mf, ssa, scp, hasA, ska) under low stringency conditions. Thirteen and 15 of 15 isolates hybridized with streptolysin O and M protein gene probes, respectively. Twelve of 15 S. canis isolates were resistant to phagocytosis in canine blood. Electron microscopy revealed the presence of proteinaceous cell surface fibrillae. These results suggest that S. canis possesses M proteins and encodes streptolysin O, but lacks some of the other recognized virulence genes with significant homology to those in S. pyogenes.     

A survey of equine abortion,stillbirth and neonatal death in the UK from 1988 to 1997

REASONS FOR PERFORMING STUDY: A detailed review of laboratory records for equine abortion is fundamental in establishing current disease trends and suggesting problems important for further research. OBJECTIVES: To review the causes of abortion and neonatal death in equine diagnostic submissions to the Animal Health Trust over a 10 year period. METHODS: The diagnoses in 1252 equine fetuses and neonatal foals were reviewed and analysed into categories. RESULTS: Problems associated with the umbilical cord, comprising umbilical cord torsion and the long cord/cervical pole ischaemia disorder, were the most common diagnoses (38.8%: 35.7% umbilical cord torsion and 3.1% long cord/cervical pole ischaemia disorder). Other noninfective causes of abortion or neonatal death included twinning (6.0%), intrapartum stillbirth (13.7%) and placentitis, associated with infection (9.8%). E. coli and Streptococcus zooepidemicus were the most common bacteria isolated. Neonatal infections not associated with placentitis accounted for 3.2% of incidents; and infections with EHV-1 or EHV-4 for 6.5%. CONCLUSIONS: Definitive diagnosis of equine abortion is possible in the majority of cases where the whole fetus and placenta are submitted for examination. Potential relevance: Given the high incidence of umbilical cord torsion and related problems as causes of abortion in UK broodmares, more research on factors determining umbilical cord length and risk of torsion is essential.     

Hepatozoon canis in a dog with oral pyogranulomas and neurologic disease

A ten-month-old Cocker Spaniel presented for fever, difficulty walking, and oral lesions. Muscle pain, bloody diarrhea, respiratory disease and central nervous system inflammation were found while the animal was hospitalized. Merozoites of Hepatozoon canis were discovered in association with pyogranulomas in a muscle biopsy. No other etiologic agent for the clinical signs was identified.