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甘保罗病弱毒疫苗对法氏囊及新城疫HI抗体滴度的影响 总被引：1，自引：0，他引：1
我场于1999年10～12月进行了甘保罗病(传染性法氏囊病，IBD)弱毒冻干疫苗免疫后对法氏囊及新城疫HI抗体滴度影响试验，结果如下。一、试验鸡及疫苗：1天龄雏鸡200羽，试验组及对照组各100羽雏鸡，饲料由我场饲料场提供。疫苗为英特威公司的IBD D－78冻干弱毒疫苗。其他免疫如新城疫、鸡痘、传支等免疫疫苗均由英特威公司提供。免疫程序为：4天龄时传支＋新城疫疫苗点眼；7天龄时鸡痘疫苗刺种；14天龄时新城疫弱毒疫苗点眼，新城疫油乳剂灭活疫苗1／2羽份胸肌注射；17天龄时IBD弱毒疫苗滴鼻。二、IBD冻干疫苗免疫后对法氏囊重量影响IB… 相似文献
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1 鸡马立克氏病1日龄用二价油佐剂灭活苗 0 .2 ml/只颈部皮下注射 ,1 4d后产生免疫力。2 鸡传染性支气管炎表 1 鸡传染性支气管炎第一种程序程序日龄疫苗种类免疫途径产生时间免疫期首免 :1～ 3日龄 H1 2 0 弱毒苗滴鼻 1滴 /只二免 :2 1日龄后 H5 2 弱毒苗滴鼻或饮水 5～ 8d 6个月 疫苗处理方法为 :H12 0 弱毒苗用生理盐水、蒸馏水或冷开水稀释 1 0倍 ;H52 弱毒苗用蒸馏水、清洁冷开水稀释 ,最好加入 0 .5%～ 1 %脱脂奶粉或葡萄糖。表 2 鸡传染性支气管炎第二种程序( H5 2 与鸡新城疫疫苗 系或 系二联苗 )程序日龄疫苗种类免疫途… 相似文献
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鸡传染性法氏囊病系列油乳剂组织灭活疫苗的研究 总被引：1，自引：0，他引：1
从多个地区收集的１０个鸡传染性法氏囊病病毒野毒株中，筛选出超强毒ＴＡ株，采用ＴＡ株对ＳＰＦ公雏攻毒，收获其法氏囊、脾脏、胸腺、肝脏、肾脏等病变组织，经处理后，与新城疫Ｌａｓｏｔａ毒株、传染性支气管炎多价毒株、ＥＤＳ７６毒株等联合，研制出了ＩＢＤ（高免免疫型）、ＮＤ－ＩＢ－ＩＢＤ、ＮＤ－ＥＤＳ－ＩＢＤ等系列油乳剂灭活疫苗，经实验室测定，并应用于蛋种鸡、肉仔鸡常规免疫以及鸡群高免等，均取得了较好的结果 相似文献
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鸡新城疫、鸡传染性支气管炎和传染性囊病都是鸡的高度接触性传染病,鸡感染龄期早、发病急,早期免疫已成为目前防治早期感染的必要措施。为了解这三种疫苗同时免疫后的效果和相互之间有无干扰,我们在分别研究了新城疫和传支以及传染性囊病1日龄免疫效果后,又对三种疫苗同时早期免疫进行了现场试验。结果表明,1日龄对传染性囊病低母源抗体的蛋鸡在实施传染性囊病免疫的同时,可以进行新支弱毒疫苗的免疫,新城疫和传染性囊病之间无干扰现象。建议现场使用如下免疫程序:1日龄使用传染性囊病弱毒疫苗和新城疫传支二联弱毒疫苗进行首免,10日龄新城疫传支联苗加强免疫,14～18日龄使用中等毒力传染性囊病疫苗进行加强免疫。在免疫后的20天内的低抗体时期内,要做好环境的消毒,减少病毒感染的机会。 相似文献
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Four apparently serologically closely related isolates of infectious bronchitis virus were obtained from two flocks of vaccinated broiler breeders, one mile apart, which were experiencing increased mortality and decreases in egg production. The isolates were serologically distinct from isolates previously described and capable of causing characteristic infectious bronchitis-like respiratory infection in young chicks. In one experiment, the H120 vaccine strain of the virus did not protect the trachea against challenge with the new isolates 21 days later. 相似文献
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This study describes a field trial in which 80 commercial layer flocks, with an increased risk of Salmonella enteritidis (SE) infection and placed on farms with a certified Standardized Biosecurity Programme (SBP) or a request for a SBP certificate, were vaccinated with a vaccine based on a live attenuated Salmonella gallinarum (SG) 9R strain. An evaluation is presented of the efficacy of the vaccine against SE infections, the effect on the performance of serologic Salmonella tests, and the spread of the vaccine strain to the egg content. For the efficacy study, assessment of the flock level occurrence of SE infections in the vaccinated group of 80 flocks was compared with that of a nonvaccinated group of 1854 flocks hatched in the same period. This control group was examined according to the compulsory control programme in The Netherlands. An evaluation was done of the performance of serologic Salmonella tests and the spread of the vaccine strain to the inner egg content of five of the vaccinated flocks. Findings demonstrated the flock level occurrence of SE infections in the vaccinated group (2/80 = 2.5%) to be significantly (P = 0.01) lower than that of the nonvaccinated group (214/1854 = 11.5%). Vaccination resulted in 59.0% positive test results in lipopolysaccharide BD enzyme-linked immunosorbent assay (ELISA) for detecting antibodies against Salmonella serogroups B and D and 0% positive test results in the rapid plate agglutination test for detecting antibodies against S. pullorum (SP)/SG. The mean specificities of two blocking ELISAs (gm- and i-double antibody sandwich ELISAs) based on the flagellar antigen of SE and Salmonella typhimurium (ST) on the same sera were 99.6% and 96.1%, respectively. The vaccine strain could not be isolated from any of the 450 pools of 10 eggs. On the basis of these results, we concluded that vaccination with a vaccine based on an attenuated SG 9R strain contributes to the reduction of SE infections in commercial layer flocks. Furthermore, serologic monitoring of SE, ST, and SP/SG can still be carried out on flocks vaccinated with an attenuated SG 9R strain. Additionally, we found no indication of the spread of the vaccine strain to the egg content. 相似文献
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Three similar flocks of broiler breeder parent chickens that had been given live infections bronchitis (IB) vaccines during rearing were injected at 20 weeks of age with three different oil emulsion vaccines: a commercial monovalent Newcastle disease (ND) vaccine (flock A); an experimental bivalent vaccine containing ND and infectious bursal disease (IBD) components (flock B); and an experimental trivalent vaccine containing ND, IBD and IB components (flock C). One week after vaccination 40 hens from flock A and 40 from flock C were taken to the laboratory and their egg yields individually recorded. At 37 weeks of age they were challenged by aerosol exposure to virulent IB virus. The egg production dropped significantly in the hens from flock A but not in the hens from flock C. On the farm, flock C showed a higher mean IB virus antibody titre four weeks after vaccination but titres rose in all three flocks indicating the presence of active IB virus infection. No differences in egg yields were found between the three farm flocks. 相似文献
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The infectious bronchitis virus (IBV) is the cause of avian infectious bronchitis (IB). IB is one of the most highly contagious diseases, which results in many economic losses in the poultry industry worldwide. The nature of this virus is such that it generates new genotypes continuously. Proper vaccination is the most suitable way of combatting IB. One of the novel genotypes of IBV, which has been circulating in the Middle Eastern countries, is the variant 2 (IS-1494/GI-23) genotype. This study aims to design and produce an autogenous variant 2 vaccines. After isolation and characterization of the Iranian variant 2, the inactivated vaccine was formulated according to the OIE guidelines, and its different aspects (Purity, titration, inactivation, immunization) were evaluated. The designed vaccine passed all of OIE quality control standards. In the assessment process, the protection rate in the groups receiving the variant 2 and commercial vaccines was 67 % and 60 %, respectively. Although the differences were not significant, they indicated better protection, and the viral load in the feces and the kidney of the group receiving the variant 2 vaccine was lower than that in the commercial vaccine. It is suggested that the variant2 strain should be added as one of the local strains to the commercial inactivated vaccines in areas affected by this genotype. The use of this vaccine in layer and breeder flocks can help to protect them against variant 2 during the production phase. Also, the transfer of maternal antibodies to offspring can provide strain-specific immunity for one-day-old chickens. 相似文献
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鸡传染性支气管炎是一种急性高度接触性呼吸道传染病,影响鸡的产蛋量和蛋品质。本研究以鸡传染性支气管炎病毒标准株M41人工感染21日龄700只海兰褐雏鸡,使其发病。接种病毒前后在饮水中分别添加不同剂量的清瘟败毒颗粒,以清瘟败毒散为对照治疗组,观察不同处理鸡的临床症状、发病率、病理变化和死亡率等。结果表明：饮水中添加0．z5％o清瘟败毒颗粒,对IBV标准株M41的攻毒保护作用与阳性对照组相比较差异显著（P〈0．05）;清瘟败毒颗粒低剂量治疗组与高、中剂量治疗组及清瘟败毒散治疗组之间差异显著,因水中添加0．5‰清瘟败毒颗粒,对人工感染鸡传染性支气管炎治疗作用明显,治愈率达88．00％,显著高于清瘟败毒散治疗组（P〈0．05）。 相似文献
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为探讨中兽药复方组合与抗生素防治肉鸡呼吸道疾病的协同效应,本研究在规模化鸡场两栋鸡舍内分别随机选取100只3日龄白羽肉鸡,分为两组（Ⅰ组和Ⅱ组）：Ⅰ组饮水添加抗生素,Ⅱ组在添加抗生素基础上的不同阶段分别饲喂中兽药玉屏风口服液（3~7 d）、射干地龙颗粒（10~16 d）、双黄连口服液（22~25 d）、麻杏石甘口服液（27~31 d）。分别于8日龄免疫鸡传染性支气管炎活疫苗、新城疫-传染性支气管炎二联活疫苗和新城疫-禽流感二联灭活疫苗,免疫后1、7、14、21、28 d采集血清和气管组织,检测新城疫、禽流感（H9）、传染性支气管炎疫苗的抗体水平,观察气管组织病理变化,计算免疫器官指数和平均日增重。结果显示,Ⅱ组的成活率较Ⅰ组提高了1.23%,Ⅱ组末体重与平均日增重极显著高于Ⅰ组（P<0.01）,分别提高了561.25和16.63 g/d;Ⅱ组病鸡呼吸道症状较Ⅰ组轻,病程短,肝脏和心脏无明显病变,脾脏指数在36 d显著高于Ⅰ组（P<0.05）。免疫后21 d,Ⅱ组新城疫、传染性支气管炎和禽流感（H9）疫苗的抗体水平达到最高,显著高于Ⅰ组（P<0.05）;免疫后28 d,Ⅱ组新城疫抗体水平极显著高于Ⅰ组（P<0.01）。综上所述,4种清热解毒、止咳平喘、清肝利胆的中兽药复方组合使用与抗生素促生长和预防肉鸡呼吸道疾病具有协同效应。 相似文献
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《The Journal of Applied Poultry Research》2014,23(2):156-164
Due to serotype variations among different avian infectious bronchitis viruses isolated in Tunisia since 2000, protection of chicks, especially broiler flocks, with Mass H120 vaccine often fails. Therefore, association of CR88 (793B type) with H120 vaccines was used for better response. Challenge experiments were then conducted to evaluate tracheal and renal cross-protection in chickens immunized via nasal and eye drops. Conferred protection was measured by clinical signs and macroscopic lesions observed, based on scores attributed according to their severities. The results showed a low protection conferred by H120 alone, as vaccination did not reduce tracheal and kidney lesions (70% scored as 3) after TN20/00 virus challenge, which also led to 10% mortality. Conversely, the challenge results indicated that the combination of the 2 strains (H120/CR88) allow high protection. Based on the results of the challenge experiments, a vaccination protocol coupling CR88 to H120 was applied for industrial broiler flocks. Clinical observations and serological results confirmed that association of heterologous serotypes (H120 and CR88 vaccines) increased the levels of protection against infectious bronchitis viruses compared with the H120 vaccine given alone. 相似文献
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为调查辽宁地区鸡传染性支气管炎病毒(IBV)的流行及遗传演化情况,从辽宁某鸡场疑似鸡传染性支气管炎病料中分离得到1株病毒,经分子生物学检测、鸡胚矮小化试验、新城疫病毒血凝特性干扰试验和动物回归试验,确定该毒株为IBV,并命名为CH/LN/2019。扩增该毒株S1基因并进行序列分析发现,分离株S1基因全长1 620 nt,编码540个氨基酸,S1蛋白裂解位点为HRRRR,属于基因Ⅰ型(QX型)毒株;同源性比对发现,分离株与基因Ⅰ型代表毒株QXIBV株的核苷酸和氨基酸序列同源性最高,分别为95.6%和94.8%;与国内常规型疫苗H52、H120和Ma5毒株的同源性较低,核苷酸和氨基酸序列同源性仅为77.2%~76.9%和75.4%~76.2%。本试验为辽宁地区鸡传染性支气管炎的流行病学调查及免疫防控提供了参考。 相似文献
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Bivalent Newcastle disease (ND)/infectious bursal disease (IBD) and trivalent ND/IBD/infectious bronchitis (IB) inactivated oil emulsion vaccines were prepared in the laboratory and evaluated under field conditions. Broiler breeder parent chickens previously vaccinated with live vaccines were inoculated with commercial monovalent ND and experimental bivalent or trivalent oil emulsion vaccines. The commercial vaccine induced a higher initial ND haemagglutination inhibition (HI) response than the experimental vaccines but, by 34 weeks after vaccination, the mean ND HI levels were not significantly different in any of the three flocks. All three vaccines provided sufficient ND immunity to protect against the clinical disease and egg production losses. The IBD responses of both flocks vaccinated with oil emulsion vaccine were similar to each other and only slightly lower than those flocks vaccinated with monovalent IBD oil emulsion vaccine in earlier experiments. Six weeks after vaccination, sufficient immunity was transferred to protect all the progeny against IBD challenge up to 33 days of age and some of them up to 45 days of age. Thirty-four weeks after vaccination of the parents with oil emulsion vaccine, the progeny were totally immune up to 27 days of age and some of them were immune until 37 days. Application of oil emulsion vaccines in bivalent or trivalent form did not impair the responses of the chickens to the monovalent components. 相似文献