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本研究旨在探索水貂肠炎病毒（mink enteritis virus,MEV）的母源抗体消长规律及其亚单位疫苗免疫效果。以免疫母貂所生仔貂为研究对象,采集21、30、45、60日龄仔貂血清,测定水貂病毒性肠炎母源抗体HI效价（MEV HI）;选取25只47~52日龄健康水貂接种制备MEV基因工程亚单位疫苗,免疫前后14 d采血测定MEV HI效价;免疫后14 d进行水貂肠炎病毒攻毒临床症状观察,并测定粪便HA效价;攻毒后14 d对濒死和存活水貂安乐死,采集十二指肠、空肠和回肠进行病理组织学观察和免疫组化检测。结果显示,免疫母貂所产仔貂的MEV HI效价随着日龄的增加逐渐降低,在21日龄时较高,45日龄时少部分仔貂MEV HI效价<1：32,60日龄时大部分仔貂HI效价≤ 1：4;使用制备合格疫苗免疫后14 d对照组水貂的MEV HI效价均不高于1：4,免疫组MEV HI效价升高至1：64~1：512;攻毒保护试验表明,免疫组水貂100%抵抗水貂肠炎病毒强毒的攻击,水貂的精神、饮食、粪便等均未见异常,且攻毒后粪便HA效价为1：8~1：16;病理组织学和免疫组化检测结果表明,MEV基因工程亚单位疫苗能够很好地阻止病毒在肠黏膜上皮细胞的复制和对肠黏膜上皮细胞的损伤。因此,免疫母貂所生仔貂21日龄时体内抗体效价最高,制备的疫苗免疫50日龄左右的水貂时能够突破母源抗体干扰并产生高水平的抗体,能够抵抗水貂肠炎病毒强毒株的攻击。 相似文献
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母源抗体对猪口蹄疫疫苗免疫应答的影响 总被引：2，自引：0，他引：2
用液相阻断ELISA(Liquid phase blocking ELISA,LPB-ELISA)和正向间接血凝(Indirect hemagglutination test,IHAT)2种血清学试验方法对规模化饲养猪群仔猪的口蹄疫母源抗体、母源抗体的传递途径、消长规律、母/仔代特异抗体相关性及母源抗体对口蹄疫疫苗免疫的影响进行了研究和分析。结果表明,2种血清学方法均没有从未吸吮初乳的新生仔猪中检出特异抗体;在吸吮初乳后的仔猪血清中可检出特异性抗体,并于10日龄左右抗体效价升至峰值,而后随着日龄的增加,特异性抗体的效价呈明显的线性下降,母源抗体半衰期约为10～20d,至45～60日龄母源抗体效价降至不完全保护带(lgX<1.8)或更低;仔猪母源抗体水平与母体特异抗体水平呈正相关。通过对不同日龄仔猪接种口蹄疫疫苗后抗体水平检测发现,仔猪体内较高水平的母源抗体对疫苗免疫应答具有明显或一定的负面影响。 相似文献
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为分析仔猪体内猪瘟母源抗体的衰减规律及母源抗体保护水平,测定了断奶时母猪和仔猪抗体水平,并监测仔猪母源抗体水平至81日龄;分别对12头81日龄仔猪（来自5头母猪）和25头35日龄仔猪（来自5头母猪）进行了攻毒试验,并用RT—nPCR进行了跟踪检测,对7头攻毒耐过猪用兔体中和法测定了中和效价。结果表明,母猪抗体水平不均衡会导致仔猪群体母源抗体水平不均衡;仔猪群体抗体到60日龄时仍然有67％（12／18）的个体用ELISA检测阻断率在50％以上：81日龄攻毒组有3头（3／12）耐过,35日龄攻毒组能全部耐过（25／25）,但有2头（2／25）在攻毒27d后仍然呈PCR阳性,此时中和抗体水平从低于1：4到1：16不等,推测中和抗体水平1：8～1：16是母源抗体保护的临界线。 相似文献
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本次试验就雏鸡首免日龄进行探讨，选用三组雏鸡分别在1日龄、7日龄、14日龄进行首免试验。通过红细胞凝集抑制（HI）试验检测雏鸡母源抗体及免疫抗体效价（各组雏鸡母源抗体效价log^2的反对数值（本文以下相同）平均为22．33、21．33、20．67；各组雏鸡免疫后13天抗体效价平均分别为211．33、20．33、29．67），并结合免疫保护攻毒试验（保护率分别为1日龄；100％；7日龄：90％；14日龄：90％）,得出：本次试验雏鸡在母源抗体效严为22．33的1日龄进行首免最合适。 相似文献
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《动物医学进展》2020,(5)
母源抗体是早期干扰活疫苗免疫效果的重要因素,通过研究商品蛋鸡法氏囊母源抗体的消长规律,并且在母源抗体达到最高峰的时候,观察免疫重组乳酸菌r-L.Lactis-VP2-RCK的免疫效果是否受到母源抗体的干扰。结果显示,母源抗体在3日龄～6日龄的时候达到最高峰,随后开始逐渐衰减;在6日龄母源抗体达到最高峰时,对低、中等和高水平的母源抗体雏鸡免疫重组乳酸菌r-L.Lactis-VP2-RCK。3个免疫组都能在免疫后1周迅速产生较高的中和抗体。研究表明,重组乳酸菌r-L.Lactis-VP2-RCK免疫雏鸡不受母源抗体干扰,并能产生显著的免疫应答,该研究结果为进一步研制商品化的重组乳酸菌活载体疫苗奠定了基础。 相似文献
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采用固定病毒稀释血清法,测定了不同日龄幼犬犬瘟热病毒(CDV)母源中和抗体效价。2、9、16和23 d幼犬平均抗体效价为1∶12、1∶24、1∶40和1∶22。幼犬23日龄时,分别接种CDV疫苗株、麻疹病毒(MV)疫苗株和正常Vero细胞培养物。结果发现,CDV疫苗株接种犬母源抗体于接种后14 d时仅为1∶6,而接种MV疫苗株和Vero细胞冻融物组CDV母源抗体未发生显著降低,接近1∶20的保护水平。本试验结果表明,当幼犬母源抗体效价为1∶20左右时,母源抗体可被CDV疫苗封闭,而MV疫苗株不受CDV母源抗体干扰。本文为临床应用MV疫苗接种幼犬,获得对CD交叉保护提供理论依据。 相似文献
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为制定科学合理的鸽新城疫(ND)疫苗免疫程序,研究比较了1日龄乳鸽新城疫病毒(NDV)母源抗体与种母鸽NDV抗体水平的相关性,对乳鸽母源抗体的衰减规律进行了检测,对采用ND活疫苗与灭活疫苗的不同组合及不同免疫次数的鸽群免疫效果进行了比较。结果显示：1日龄乳鸽NDV母源抗体水平与种母鸽抗体水平呈极显著正相关(r=0.93);乳鸽NDV母源抗体水平在1日龄时为(8.38±1.51)log2,5日龄时略有上升,随后逐日下降,22日龄时降至抗体临界保护值4 log2以下,母源抗体半衰期约为4.45 d;无论采用何种疫苗组合,各免疫组NDV抗体水平在二免后17 d均升至9 log2以上,随后逐渐下降,但在二免后5个月依然维持在7.80 log2以上;除首免后40 d A-1组抗体效价显著高于B-2组、A-2组抗体效价极显著高于B-2组,以及首免后93 d时A-1组显著高于B-2组外,其余各时间点各免疫组之间抗体效价差异均不显著;在种鸽场的实际生产中,鸽群如60日龄转入飞棚时未经免疫,抗体水平在二免后21 d(... 相似文献
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Ultrastructural studies of blue fox spermatozoa 总被引：1，自引：0，他引：1
K Andersen 《Acta veterinaria Scandinavica》1974,15(4):620-630
The fine structure of epididymal and ejaculated spermatozoa from blue fox is analyzed by electron microscopy. The result of this investigation seems to indicate that the blue fox spermatozoon is of the same type as that of the dog. The apical body appears, however, to have a rather characteristic shape and to be more well-developed than found in sperm cells from the usual domestic animals.The other structures studied in the different parts of the blue fox spermatozoon including the head, neck and flagellum displayed the same principal characteristics as those in the sperm cells of other domestic species.In a few cases double development of the middle piece could be observed. 相似文献
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Hostnik P Barlic-Maganja D Toplak I Grom J 《Journal of veterinary medicine. B, Infectious diseases and veterinary public health》2003,50(4):204-206
The persistence of maternal antibodies transfer from rabies-immune vixens to their fox cubs was studied. Eight vixens (Vulpes vulpes) were vaccinated 1 month before pregnancy with Lysvulpen vaccine for oral vaccination of foxes. Twenty-one were foxes born at the first half of April. The geometrical mean titre of rabies neutralizing antibodies of fox cubs sampled in May was 1.31 IU/ml and has dropped successively to 0.54 IU/ml in June samples and to 0.18 IU/ml in July samples. It has been proven that the duration of rabies maternal antibodies in fox cubs was limited to 2 months after birth. 相似文献
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通过ＭＤＣＫ传细胞从黑龙江某狐场疑似狐狸脑炎病狐的肝脏中分离到对本动物具有较强致病能力的强毒株,定名为ＦＥＶ－Ｈ。经系统鉴定,并与已知国内分离毒株狐狸脑炎病毒ＦＥＶ－８８０１,狐喉气管炎病毒ＦＡＶ－２比较,证实为狐狸脑炎病毒,属犬１型腺病毒（ＣＡＶ－１）。 相似文献
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S F Mohn 《Acta veterinaria Scandinavica》1982,23(1):99-106
Sera from 32 foxes sampled at intervals varying from 20 to 70 days after oral inoculation with E. cuniculi spores were tested by the india-ink immunoreaction (IIR) and the indirect fluorescent antibody test (IFAT). Using the IFAT, antibodies were detected at low levels in sera sampled on days 20 and 29 post inoculation, whereas the IIR failed to reveal antibodies in the same sera. In sera sampled from day 35 until day 70 post inoculation, antibodies were detected by both tests, the IIR-titres reaching the magnitude of the IFAT-titres after about 50 days posit inoculation.In 14 sera sampled from foxes of at least 46 days of age and with signs of encephalitozoonosis, the tests gave almost identical results.Comparing IIR- and IFAT-determined antibody titres using E. cuniculi antigens of blue fox and rabbit origin in the test, the antigens seemed to be closely related, supporting the suggestion that the isolates are strains of the same microsporidian species. 相似文献
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Moe RO Bakken M Brun-Hansen H Adnøy T Morberg H 《Veterinary clinical pathology / American Society for Veterinary Clinical Pathology》1999,28(2):65-70
Differential leukocyte (WBC) counts in blood from clinically healthy silver foxes (n=32) and blue foxes (n=37) obtained from an automated hematology analyzer (Technicon H*1 Hematology System) with canine software were compared with microscopic differential WBC counts (M-diff). There was good agreement between the automated differential cell count (A-diff) and the M-diff for neutrophil and lymphocyte percentages. The correlation was lower for monocyte percentages and variable for eosinophil percentages. There was no significant difference between the A-diff and M-diff in either fox species. The A-diff counts were very precise, and may be a good alternative to the traditional M-diff for screening populations of clinically healthy foxes or for studies on stress and animal welfare. Intercept values, however, indicated a constant bias that must be taken into account before interpreting results based on different methods of analysis 相似文献
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某银狐养殖场幼狐发病,根据实验室诊断,确诊为沙门氏菌与大肠杆菌混合感染,且两种菌均具有强致病性,药敏试验结果为临床用药提供参考依据。 相似文献