猪蓝耳病不同类型疫苗体液免疫效果的比较

为比较不同类型猪蓝耳病疫苗的体液免疫效果,在2008年10月~2010年11月对12个规模猪场进行观察,采用进口弱毒疫苗、国产弱毒疫苗、普通灭活疫苗、猪高致病性蓝耳病灭活疫苗进行免疫。30天后采集猪的血清,进行免疫抗体检测,观察效果。通过比较发现生产母猪使用不同类型猪蓝耳病疫苗后,产生的抗体阳性率明显高于仔猪免疫后所以产生的抗体阳性率。由此可见,对于生产母猪使用蓝耳病疫苗效果明显,在对蓝耳病防治中,可以主要以生产母猪进行疫苗防止为主,对于其他仔猪也可以进行。     

不同类型猪蓝耳病疫苗的体液免疫效果比较

目的:探究不同类型的猪蓝耳病疫苗具有的体液免疫效果。方法:从我国选取7个未曾感染过猪蓝耳病的比较有规模的猪场作为研究对象,分别对生产母猪与仔猪给予疫苗免疫,注射的疫苗包括猪蓝耳病国产弱毒疫苗、进口弱毒疫苗、普通灭活疫苗,对生产母猪与仔猪进行二免28天之后,采集它们的血清后对免疫抗体进行检测。结果:对生产母猪与仔猪进行不同类型蓝耳病疫苗免疫后,前者产生的抗体阳性率明显高于后者的抗体阳性率。结论:对于猪蓝耳病而言,目前还欠缺大量的研究,为了提高生产母猪与仔猪的成活率与生存质量,应加大不同类型疫苗的研究与应用。     

不同类型猪蓝耳病疫苗的免疫探讨

为科学评价不同猪蓝耳病疫苗免疫效果,选取19个规模猪场,分别使用蓝耳病国产弱毒疫苗、进口弱毒疫苗、普通灭活疫苗、猪高致病性蓝耳病疫苗进行免疫,免疫1月后,采集免疫猪群的血清与全血样品,进行PRRSV病原学和免疫抗体检测,结果显示:国产弱毒疫苗、进口弱毒疫苗、普通灭活疫苗、高致病性猪蓝耳病灭活疫苗、对照组抗体阳性率分别为86.40%、76.10%、36.70%、49.30%、31.17%。使用PRRS弱毒疫苗免疫组PRRSV变异株检出率较高,使用高致病性PRRS灭活疫苗免疫组PRRSV普通株检出率较高。此结果提示PRRS疫苗免疫后能产生一定的保护性抗体水平,但交叉免疫保护性较差。对于PRRS的防控,关键在于提高猪群PRRS抗体的水平与整齐度,同时加强饲养管理。     

高致病性猪蓝耳病弱毒疫苗与灭活疫苗的免疫效果评估试验

在相同饲养条件下,对35日龄仔猪分别使用高致病性猪蓝耳病弱毒疫苗与灭活疫苗进行免疫接种。在接种当天、接种后28d、58d分别检测高致病性猪蓝耳病免疫抗体水平。结果显示,使用弱毒疫苗免疫的试验猪,其高致病性猪蓝耳病抗体上升速度和抗体水平均优于使用灭活疫苗的试验猪。弱毒疫苗可在接种后21～28d产生免疫力,免疫期为4个月。猪繁殖与呼吸综合征流行地区应该首先考虑使用弱毒疫苗。     

PRRSV灭活疫苗与弱毒疫苗的免疫效果比较

为比较猪蓝耳病灭活疫苗与弱毒疫苗的免疫效果,本试验在惠城区某猪场随机选取100头仔猪,分成两组,分别免疫猪蓝耳病灭活疫苗与弱毒疫苗,采用ELISA方法检测血清中的抗体水平,并对两组抗体的S/P值进行比较。结果表明,猪蓝耳病弱毒疫苗产生的抗体水平比灭活疫苗高,灭活疫苗免疫效果较差,且抗体持续时间短。本研究为猪场蓝耳病的防控及免疫程序的制定提供理论依据。     

猪蓝耳病灭活疫苗与弱毒疫苗免疫后的抗体水平比较

为比较猪蓝耳病灭活疫苗与弱毒疫苗的免疫抗体水平,本试验在惠城区某猪场随机选取100头仔猪,分成两组,分别免疫猪蓝耳病灭活疫苗与弱毒疫苗,采用ELISA方法检测血清中的抗体水平,并对两组抗体的S/P值进行比较。结果表明,猪蓝耳病弱毒疫苗产生的抗体水平比灭活疫苗高,灭活疫苗免疫效果较差,且抗体持续时间短。本研究为猪场蓝耳病的防控及免疫程序的制定提供参考依据。     

不同蓝耳病疫苗对仔猪免疫效果试验

选取了100只猪蓝耳病抗体检测呈阴性的仔猪作为研究对象,给仔猪进行不同疫苗注射,28 d后采集免疫仔猪的血清进行免疫抗体检测。结果表明,仔猪首次免疫和加强免疫使用弱毒疫苗的抗体阳性率达75%以上,远远高于灭活疫苗的抗体保护率30%~40%。为临床猪蓝耳病的防治提供了有力的依据。     

高致病性蓝耳病弱毒疫苗及灭活疫苗免疫效果的比较

为比较灭活、弱毒两种常规猪蓝耳病疫苗的免疫效果,于2011年9—10月梓潼县秋季防疫工作期间,对该县32个乡镇使用不同种类猪蓝耳病疫苗进行免疫并跟踪调查,免疫28天后采集猪血清样品进行免疫抗体检测.结果显示:猪蓝耳弱毒疫苗免疫后产生的抗体阳性率(94.55%)及OD值(1.108)均高于灭活疫苗(49.30%,0.3758),弱毒组OD值的标准误(0.03483)高于灭活组(0.01926).结果表明,猪蓝耳病弱毒疫苗能产生较高的抗体水平,但其整齐程度不及灭活疫苗.     

仔猪病毒性腹泻疫苗免疫效果比较

为探讨商品化猪病毒性腹泻三联弱毒疫苗和二联灭活疫苗对仔猪免疫效果的影响,通过前期妊娠母猪跟胎免疫,随机选择胎次相近、无病史新生仔猪80头,随机分成3个试验组和1个对照组。对照组不免疫;试验组仔猪于28日龄首免和65日龄二免三联弱毒疫苗或二联灭活疫苗,应用ELISA试剂盒进行血清抗体检测。结果表明:试验组抗体阳性率均高于对照组(P0.01),试验组间抗体阳性率第3组高于第1组和第2组(P0.05),腹泻疫苗在母猪妊娠期接种对仔猪表现出一定的保护力,交替免疫三联弱毒疫苗或二联灭活疫苗效果最佳。本研究为猪病毒性腹泻疫苗免疫提供可行依据。     

猪蓝耳病弱毒苗对猪的免疫效果分析

目的观察高致病性猪蓝耳病弱毒疫苗对猪的免疫效果。方法从某猪场选取90头仔猪,随机分为A组、B组、对照组,各30头。A组接种高致病性猪蓝耳病弱毒疫苗,B组接种高致病性猪蓝耳病灭活疫苗,C组给予生理盐水作为对照组。在免疫后28d、60d、90d时对比三组的S/P值与PRRS抗体阳性率。结果免疫28d时,A组仔猪S/P值超过2.0,增速很快,其PRRS抗体检测阳性率高达93.3%,B组为33.3%,差异显著(P0.05),有统计学意义。结论与灭活苗相比,高致病性猪蓝耳病弱毒苗抗体水平与抗体增速均更明显,免疫效果更好,因此,可优先考虑弱毒疫苗。     

猪繁殖与呼吸综合征疫苗研究进展

猪繁殖与呼吸综合征是一种引起母猪繁殖障碍和新生仔猪呼吸道症状及高死亡率的传染病。在世界包括中国在内的各养猪国家广泛流行,造成严重经济损失,受到国内外学者的高度重视,对此病的研究特别是对其疫苗的研究正日益受到关注。文章就猪繁殖与呼吸综合征病毒的灭活疫苗、弱毒疫苗和基因工程疫苗的研究进展做了详细的阐述。     

猪口蹄疫、猪瘟、猪蓝耳病疫苗最佳免疫方法研究

为探索生猪重大疫病的科学免疫方法,确定最佳免疫程序,笔者设计并开展了口蹄疫（FMD）合成肽苗（或灭活苗）、猪瘟（HC）脾淋苗、高致病性蓝耳病弱毒疫苗（或灭活苗）的不同组合注射、单独注射、不同疫苗类型注射的试验研究.结果表明：3种疫苗不同组合注射或单独注射,以及使用不同类型疫苗注射,其免疫副反应均无明显差异;平均免疫抗体效价及群体合格率各组间存有差异;采用猪口蹄疫、猪瘟、猪蓝耳病3种疫苗同时分点注射,以及仔猪首免口蹄疫、猪蓝耳苗,再免疫口蹄疫、猪瘟苗的免疫效果最佳.     

The use of different vaccination schedules for sows to protect piglets against Aujeszky's disease

Several Aujeszky's disease virus (ADV) vaccination protocols of sows were evaluated with regard to the passive protection conferred on piglets in a recently built commercial farm. Three different groups of sows were vaccinated using a Bartha K-61 strain. One group received an inactivated vaccine during pregnancy and the other two groups received attenuated vaccines, either during pregnancy (day 65) or on the seventh day of lactation. At farrowing, sows vaccinated during lactation had lower seroneutralization titres than those vaccinated during pregnancy either with inactivated or attenuated vaccines. Accordingly, their piglets were the ones with lower levels of maternally transferred neutralizing antibodies. At 4 weeks of age, five piglets born of each group of sows were challenged intranasally with a neurotropic strain of ADV. Piglets born of sows vaccinated during pregnancy with inactivated and attenuated vaccines gained 1.50 kg bodyweight and 2.50 kg bodyweight during 7 days, respectively, and did not show clinical signs, while piglets from sows vaccinated during the previous lactation lost 0.60 kg and presented moderate to severe clinical signs of ADV. Vaccination of sows during pregnancy provided more protection against ADV for piglets than sow vaccination before mating. Piglets born from sows vaccinated with attenuated or inactivated vaccines did not present remarkable differences on protection.     

Experimental inoculation of late term pregnant sows with a field isolate of porcine reproductive and respiratory syndrome vaccine-derived virus.

The use of a live attenuated porcine reproductive and respiratory syndrome virus (PRRSV) vaccine in piglets has been associated with reproductive disorders in non-vaccinated sows. Vaccine-derived virus (VDV) has been isolated from foetuses, stillborn pigs, and dead piglets, indicating that the live vaccine spread from vaccinated piglets to non-vaccinated sows, and that the virus might be implicated in the severe reproductive problems observed. In the present study, one such VDV isolate was used to experimentally infect pregnant sows in the last trimester. The chosen isolate, which had more than 99.6% identity to the attenuated vaccine virus, originated from the lungs of a stillborn pig from a swine herd with a sudden high level of stillborn pigs and increased piglet mortality in the nursing period. Intranasal inoculation of sows with the virus isolate resulted in congenital infection, foetal death, and preweaning pig mortality. As such, the present study showed that vaccine-derived PRRSV can cause disease in swine consistent with PRRS.     

Sow performance in an endemically porcine reproductive and respiratory syndrome (PRRS)-infected farm after sow vaccination with an attenuated PRRS vaccine

The objective of this field study was to evaluate in an endemically porcine reproductive and respiratory syndrome (PRRS) virus-infected farm the reproductive performance of sows after their vaccination with a PRRS attenuated vaccine. In a farrow-to-finish pig farm with history of endemic PRRS virus infection, a total of 200 gilts and sows were used. They were divided in 2 groups of 100 animals. The first group was used as untreated controls, while the animals of the second group were vaccinated against PRRS virus using the attenuated Porcilis PRRS vaccine (Intervet International, The Netherlands) based on European strain. All health and reproductive parameters were recorded from the time of vaccination up to next weaning. No adverse systemic or local reactions or side effects relative to vaccination were noted. Compared to controls, vaccinated sows showed significantly improved farrowing rate (89% versus 78%) and a tendency for fewer returns to oestrus, particularly those at irregular intervals. Fewer sows farrowed prematurely and showed post-partum dysgalactia syndrome, but more live pigs were born and weaned in each litter after vaccination. It was concluded that vaccination of sows with Porcilis PRRS attenuated vaccine in farms with endemic PRRSV infection has beneficial effects on their health and fertility.     

三个厂家猪瘟活疫苗免疫效果比较试验

在同一条件下对3个厂家生产的猪瘟细胞源活疫苗进行了免疫效果评价试验,并与猪瘟传代细胞苗免疫效果进行比较。结果发现3个厂家生产的猪瘟细胞源活疫苗存在一定差异,2个厂家的免疫效果较好,1个厂家的免疫效果较差。猪瘟传代细胞苗免疫效果优于猪瘟细胞源活疫苗,猪瘟传代细胞苗免疫1次,抗体合格率高,持续时间长,猪瘟细胞源活疫苗要免疫两次才能获得比较好的效果。同时,我们发现高致病性猪蓝耳病活疫苗（JXA1-R株）对猪瘟抗体产生有一定影响。     

FMD、HC和PRRS疫苗不同组合接种免疫效果的此较

为了研究猪O型口蹄疫(FMD)、猪瘟(HC)、高致病性猪蓝耳病(PRRS)疫苗不同组合的免疫效果,在黔东南州3个养殖场各选择35日龄仔猪120头.每个场分成6个实验组,每组20头,在免疫后的21、28、35、42、49、56、63 d采血检测抗体,FMD、HC用正向间接血凝试验检测,PRRS用间接EIJSA检测.结果表...     

猪瘟脾淋苗、猪O型口蹄疫和猪蓝耳病灭活苗两两联合应用的免疫效果观察

将猪瘟弱毒脾淋疫苗、猪O型口蹄疫灭活疫苗(Ⅱ)和高致病性猪蓝耳病灭活疫苗采用两两组合的方式同时分部位免疫35日龄左右的健康仔猪,观察并记录其免疫反应。在疫苗免疫后0、4、14、21d和28d无菌取猪血清,用ELISA检测免疫后三种疫苗抗体水平的动态变化。试验结果表明:猪瘟和猪口蹄疫疫苗同时免疫,效果较好;猪口蹄疫和高致病性猪蓝耳病疫苗同时免疫,效果较差;猪瘟疫苗和高致病性猪蓝耳病疫苗同时免疫,效果不明显,还需进一步验证。     

Analysis of the Immune Efficacy of Attenuated Live Vaccine in the Pig Herds Previously Infected with Wild-type Porcine Reproductive and Respiratory Syndrome Virus

To evaluate the immune efficacy of porcine reproductive and respiratory syndrome (PRRS) attenuated live vaccine,this study selected 4 litters from two small pig farms (two litters each farm) and vaccinated with porcine reproductive and respiratory syndrome virus (PRRSV) attenuated live vaccine.Sera were collected on different days post vaccination (dpv) to detect PRRSV nucleic acid by RT-PCR,and PRRSV antibody using two different ELISA Kits,i.e.N-ELISA and G-ELISA.The results showed that PRRSV nucleic acid were positive on 0 dpv until 30 dpv in piglets and also positive on 0 dpv in the corresponding sows.All piglets were negative for PRRSV antibody on 0 dpv,but were positive on 30 dpv until 150 dpv.The positive rates detected by N-ELISA Kit were higher than those of G-ELISA Kit on 30 and 60 dpv,but lower than those of G-ELISA Kit on 120 and 150 dpv.A total of 216 sera were detected respectively by two ELISA Kits and the coincidence rate of the results was 95.83%.The P value of χ² test was more than 0.05,showing there was no significant difference between the results of two Kits.The Kappa value was 0.87,showing there was strong consistence between them.The correlation coefficient was 0.605,showing there was significantly linear correlation between them.The results indicated that the wild-type PRRSV in the previously infected pig herds could be eliminated by vaccination with attenuated live vaccine and both N-ELISA and G-ELISA Kits could be used to estimate the immune efficacy of the attenuated live vaccine effectively.     

PRRSV野毒感染猪群免疫接种弱毒活疫苗的效果分析

为评估猪繁殖与呼吸综合征（porcine reproductive and respiratory syndrome,PRRS）弱毒活疫苗的免疫效果,本研究在两个小型猪场各选取两窝仔猪,在免疫接种猪繁殖与呼吸综合征病毒（porcine reproductive and respiratory syndrome virus,PRRSV）弱毒活疫苗后不同时间采集血清,应用RT-PCR检测PRRSV核酸,应用N-ELISA和G-ELISA两种试剂盒检测PRRSV抗体。结果发现,免疫前0 d可以从仔猪血清中检测到PRRSV野毒株核酸,可持续到免疫后30 d;相对应的母猪在免疫前0 d可从血清中检测到PRRSV野毒株核酸。试验仔猪在免疫前0 d未能检测到PRRSV抗体,但在免疫后30～150 d均可检测到PRRSV抗体,其中N-ELISA试剂盒的阳性检出率在免疫后30、60 d高于G-ELISA试剂盒的阳性检出率,而在免疫后120、150 d则低于G-ELISA试剂盒的阳性检出率。使用两种ELISA试剂盒共同检测216份血清样品,检测结果的总体符合率为95.83%;配对χ²检验,P>0.05,两者差异不显著;Kappa值为0.87,属于极强一致性;两者相关系数r为0.605,具有显著线性相关。表明免疫接种弱毒活疫苗可以有效清除野毒感染猪群中的野毒株,N-ELISA和G-ELISA两种ELISA试剂盒均可用于评估弱毒活疫苗的免疫效果。