共查询到19条相似文献，搜索用时 718 毫秒
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辽宁省大连市某人工池塘养殖的淡水鱼苗出现大量死亡。从病死鱼体内分离到一株致病性嗜水气单胞菌和一株类志贺邻单胞菌。对鱼饲料、池塘环境样品进行细菌计数与优势菌筛查,发现池底淤积物和池塘排水管污物中细菌总数严重超出限值,优势菌为致病性嗜水气单胞菌、类志贺邻单胞菌和摩氏摩根菌,与病死鱼体内分离到的细菌基本一致。由此判断引起池塘鱼感染的细菌主要来源于池底淤积物和池塘排水管污物。 相似文献
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《黑龙江畜牧兽医》2014,(11)
为了研究眼镜蛇腐皮病的致病菌,试验采用细菌分离培养的方法,在无菌条件下,从患腐皮病眼镜蛇皮肤溃烂处挑取少许内容物划线接种于普通琼脂平板、兔血平板、SS琼脂平板及真菌培养基上,继而选取优势菌落进行分离、纯培养。结果表明:得到9种细菌,没有发现真菌。根据细菌形态、菌落生长特征和生化特性得出,这9种细菌分别为:黏质沙雷菌1株、奇异变形杆菌3株、铜绿假单胞菌3株、克氏耶尔森菌1株、肺炎克雷伯菌1株、雷极普鲁威登斯菌1株、嗜麦芽假单胞菌1株、金黄色葡萄球菌1株和腐生葡萄球菌3株。经致病性试验证实,奇异变形杆菌、铜绿假单胞菌、克氏耶尔森菌、雷极普鲁威登斯菌、嗜麦芽假单胞菌和金黄色葡萄球菌具有致病性,黏质沙雷菌、肺炎克雷伯菌和腐生葡萄球菌无致病性。药物敏感性试验证实:在15株致病菌中,除克氏耶尔森菌外,均对妥布霉素和庆大霉素高度敏感;嗜麦芽假单胞菌对妥布霉素不敏感,对庆大霉素高度敏感;除金黄色葡萄球菌外,均对阿米卡星高度敏感;15株致病菌均对头孢类抗生素不同程度敏感;哌拉西林、氨曲南和卡那霉素对大部分菌有抑制作用。说明眼镜蛇腐皮病主要由致病性细菌引起,敏感药物治疗后有良好效果。 相似文献
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南昌某猪场仔猪大量死亡,为了查明病因,找到防控的有效办法,对死亡仔猪病变部位进行细菌分离培养,得到分离菌Z-d-1、Q-d-1、Q-d-2,用常规法对3株分离菌进行生化鉴定、药敏试验、致病性试验、体外抑菌试验。结果:Z-d-1与大肠杆菌的生化特性一致;Q-d-1、Q-d-2与气单胞杆菌生化特性一致;3株分离菌对大部分抗生素耐药,对丁胺卡那、呋喃唑酮均高敏;攻毒小白鼠24 h均死亡;乳酸菌对其均有较好的抑制作用。结论:分离菌Z-d-1为大肠杆菌,Q-d-1、Q-d-2为嗜水气单胞杆菌;该病为大肠杆菌与嗜水气单胞杆菌混合感染所致;乳酸菌可取代或部分取代抗生素对该病的防治。 相似文献
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长薄鳅腐皮病致病菌的研究 总被引：4，自引：0，他引：4
从患腐皮病的长薄鳅鱼体中分离到M－01,M－02两株细菌,经人工感染试验均对健康长薄鳅表现出较强的致病性,出现与自然患病长薄鳅相同症状,由此证实这两菌株是长薄鳅腐皮病致病菌。试验测得M－01,M－02菌株对泥鳅的LD50分别是1．83×10^-5个菌／ml和5．92×10^5个菌／ml。据菌株形态特征,培养特性和生理生化反应的特点,初步鉴定致病菌为嗜水气单胞菌（Aeromonas hydrophila)和温和气单胞菌（Aeromonasd sobria)。药敏试验表明以上两株细菌对很多抗菌药物敏感。 相似文献
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<正>绵羊刚果嗜皮菌病是由刚果嗜皮菌(Dermatophilus congolensis)引起各种动物及人的一种皮肤传染病,曾称绵羊真菌性皮炎、疙瘩羊毛病、羊毒样腐蹄病、皮肤雨伤病,以头部、腹部和四肢皮肤形成紧密粘着的毛结和红棕色痂块性皮疹为特征。1病原学嗜皮菌属于嗜皮菌科(Dermatophilaceae)嗜皮菌属(Dermatophilus)的成员,菌体结构因培养基类型及培养时间不同而不同,有菌丝期和孢子期两个 相似文献
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中华鳖“腐皮病”病原的研究 总被引：4，自引：0，他引：4
对江苏省吴县、吴江等地区养殖的患“腐皮病”的中华鳖的病原进行了分离，从病鳖的肝脏分离得菌株B-1，用菌株B-1进行人工感染，100%的鳖患病，出现与自然病鳖相同的症状。对B-1株进行菌体形态特征、培养特性、生理生化反应及致病因子检测，证明该菌为致病性嗜水气单胞菌。 相似文献
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鲤源嗜水气单胞菌分离鉴定、耐药性及毒力基因检测 总被引：1，自引：0，他引：1
为查明贵州某鲤鱼养殖厂鲤鱼死亡的病因,本试验进行了细菌分离培养、菌体形态观察、细菌生理生化鉴定、16S rRNA基因测序分析、药敏试验、耐药基因检测、动物感染试验、毒力基因检测等。结果显示,从死亡鲤鱼病变组织中分离到的细菌呈圆形凸起、表面光滑的灰白色菌落,为革兰氏阴性短杆菌;生化鉴定结果显示,分离菌具有运动性,能发酵葡萄糖产酸产气,精氨酸双水解酶、赖氨酸脱羧酶、M-R和V-P试验阳性;应用细菌16S rRNA基因通用引物进行PCR扩增获得大小为1 421 bp的片段,测序发现,该分离菌与16株嗜水气单胞菌相应序列同源性达75.3%~100.0%;药敏试验结果显示,该分离菌对氟苯尼考、头孢曲松、妥布霉素、氧氟沙星、恩诺沙星5种药物呈现高度敏感,对复方新诺明、磺胺异噁唑、羧苄西林等药物呈现耐药,经耐药基因PCR检测显示,该分离菌携带Sul1、Sul2和Intl1 3种耐药基因,与药敏表型相符;人工感染试验显示,该分离菌有致病力,经毒力基因检测显示,该分离菌携带aer、hly和act 3种毒力基因。上述试验结果表明,本研究分离得到了一株耐磺胺类药物的鲤源嗜水气单胞菌,为该鲤鱼养殖厂的鲤鱼疾病防治与合理用药提供了科学依据。 相似文献
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Bacteria, isolated from the skins of clinically normal sheep, were tested for inhibitory activity against Dermatophilus congolensis grown in vitro. Out of 85 bacterial isolates, 19, mainly Bacillus spp., showed zones of inhibition when grown together with D. congolensis. The inhibitory activity was shown to be due to the metabolites released by the bacteria. 相似文献
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Quantification of a T6-lymphocyte antigen in peripheral blood mononuclear cells of sheep was used to select 15 from 48 one year old Merino ewes not previously exposed to Dermatophilus congolensis infection. These sheep were compared in response to challenge with D. congolensis zoospores and levels of T-6 lymphocyte antigen in peripheral blood mononuclear cells with 15 Merino ewes of similar age and strain from a different site that had been treated and recovered from chronic dermatophilosis. The T-6 lymphocyte antigen levels were significantly lower in the chronic dermatophilosis sheep and they developed significantly more severe lesions than the selected, previously unexposed sheep despite the former sheep having high serum antibody levels to D. congolensis. Measurement of the fleece characteristics, wax and suint concentration showed no differences between the groups that might have explained the considerable differences in their susceptibility to dermatophilosis. 相似文献
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Cross-protection studies were conducted with vaccines prepared from two isolates of Dermatophilus congolensis (designated strain 1 and strain 2). The vaccines were prepared as either heat-inactivated, washed, formalized filamentous phase bacterium, mixed with alum as an adjuvant, and inoculated intramuscularly (type A vaccine) or sedimented live filaments inoculated intradermally (type B vaccine). The vaccinated sheep were challenged with D. congolensis zoospores of one or other strain. Challenge sites were observed for the presence and severity of lesions. Serum antibody levels to D. congolensis were monitored after vaccination and challenge. Type A and B vaccines from both strains produced some reduction in the severity of lesions when sheep were challenged with strain 1 but not with strain 2. Unvaccinated control sheep developed more severe and persistent lesions when challenged with strain 2 than controls challenged with strain 1. Serum antibody levels to the type B vaccine prepared from strain 1 were significantly higher (P less than 0.05) than antibody levels to type B vaccine from strain 2. These findings showed there was significant variation in virulence and antigenicity between these two isolates of D. congolensis. 相似文献
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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。 相似文献
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对FC株猪源性肠毒素型大肠杆菌致病因子的研究 总被引：1，自引：0，他引：1
FC菌株是一株从腹泻仔猪粪便中分离的肠毒素型大肠杆菌(Enterotoxigenic E.coli,ETEC)。在MRHA反应中,本菌能凝集人O型、豚鼠、马、绵羊、牛、鸡和兔的红细胞,对人O型和豚鼠红细胞有很高的血凝性,血抗K88和K99血清不能抑制其对豚鼠和绵羊红细胞的血凝。在体外小肠上皮细胞吸附试验中,本菌对仔猪小肠上皮细胞具有强烈的吸附作用;透射电镜和扫描电镜观察证实了FC株菌除表面具有一种纤毛样结构外,还能定居在仔猪小肠段。血清学试验结果表明,本菌的O抗原属于O101。K88和987P两种抗血清均不能凝集本菌,而K99和F41抗血清均可凝集。对纯化的FC株菌粘着素抗原作等电聚焦和聚丙烯酰胺凝胶电泳分析,结果表明,该菌的粘着素是由等电点分别为4.61和9.78,分子量分别为29500和17500的两种蛋白质抗原所组成。此外,用乳鼠胃内投服试验和兔肠结扎试验证明,该菌只产生热稳定肠毒素。总之,本菌是一株能产生ST的K99,F41的肠毒素型大肠杆菌。 相似文献
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The cellular response in the skin of Merino sheep was examined after three successive inoculations with Dermatophilus congolensis. There was a massive neutrophil influx into the infected epidermis and underlying dermis at 4-10 days after the first inoculation. A lymphocyte-macrophage response occurred at 10-12 days, followed by a plasma cell response at 14-38 days. Resolution of skin lesions after the first inoculation corresponded to the time when the plasma cell response in the skin was most intense. A second inoculation with D. congolensis, 70 days after the first, failed to produce skin lesions typical of dermatophilosis. Typical lesions of dermatophilosis did develop after a third inoculation of the same sheep 140 days after the first inoculation, but the lesions resolved in most sheep within 13 days. Dermatophilosis did not develop in some of these sheep at sites inoculated with 100-1000-fold lower infective doses of D. congolensis, whereas control sheep did develop lesions. 相似文献
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Components of inflammatory and immunological responses were compared in 17 Merino sheep with chronic dermatophilosis (Group 1) and 15 Merino sheep that had recovered from the disease (Group 2). The functions studied included: (i) total and differential white cell counts; (ii) phagocytic function and intracellular killing by neutrophils; (iii) humoral immune response to T-dependent and T-independent antigens and to Dermatophilus congolensis. (iv) lymphocyte blastogenic responses to phytohaemagglutinin; (v) bovine serum albumen and D. congolensis antigens; (vi) quantification of T-lymphocyte subsets in skin lesions resulting after re-infection with D. congolensis zoospores. After all lesions were treated and the sheep were shorn, both groups of sheep were re-infected with D. congolensis. Both groups had similar infection rate, severity of lesions and rate of resolution after re-infection. The Group 2 sheep had significantly higher primary and secondary antibody responses to killed Brucella abortus cells than Group 1 sheep, but Group 1 sheep had higher levels of specific D. congolensis antibody throughout the trial. Neutrophils from Group 1 sheep showed a higher phagocytic rate for D. congolensis zoospores than Group 2 sheep when the zoospores were opsonised by sera from the Group 1 sheep, but there was no difference in their ability to kill ingested zoospores. Although there were some differences between the groups in the proportion of lymphocytes in lesions that reacted with monoclonal antibodies to T4, T8 and T19-19 lymphocyte markers at various times after re-infection, the sheep in Group 2 consistently had higher levels of lymphocytes reacting to a monoclonal antibody for the T6 lymphocyte antigen in skin biopsies collected 9, 15 and 21 days post-inoculation (p.i.) than did sheep in Group 1. Group 2 sheep also had higher levels of epidermal cells with immunohistochemical properties of Langerhans cells at lesion sites 15 and 21 days p.i. 相似文献
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布鲁氏菌弱毒疫苗粘膜免疫及检测方法的研究 总被引：1，自引：0，他引：1
为研究布鲁氏菌弱毒疫苗粘膜免疫及其检测方法,本实验采用粘膜点眼途径对健康母羊接种布鲁氏杆菌猪2号疫苗(S2)、牛19号疫苗(A19)和羊强毒株(M16),筛选布鲁氏杆菌病鉴别检测方法。将12月龄～14月龄母羊60只随机分为3组,以常规疫苗推荐剂量进行半量粘膜点眼接种。采集血液、淋巴、脏器进行布鲁氏菌病血清学检测和细菌学分离以及PCR检测。结果表明:布鲁氏菌弱毒疫苗抗体水平持续6个月,其中血清学的试管凝集试验、半胱氨酸凝集试验与补体结合试验的阳性符合率达到100%。细菌分离期为6个月,乳腺、乳腺淋巴、髂淋巴分离率较高;而强毒株M16的抗体水平和细菌分离持续12个月以上。结果显示以常规血清学和细菌学检测方法在点眼免疫布鲁氏菌S2、A19苗6个月后可以进行野毒感染和疫苗免疫畜的鉴别诊断。 相似文献