Newcastle disease virus vectored infectious laryngotracheitis vaccines protect commercial broiler chickens in the presence of maternally derived antibodies
文献类型: 外文期刊
第一作者: Yu, Qingzhong
作者: Yu, Qingzhong;Spatz, Stephen;Li, Yufeng;Yang, Jilong;Zhao, Wei;Zhang, Zhenyu;Wen, Guoyuan;Zsak, Laszlo;Garcia, Maricarmen;Li, Yufeng;Yang, Jilong;Zhao, Wei;Zhang, Zhenyu;Wen, Guoyuan
作者机构:
关键词: NDV;ILTV;Recombinant vaccine;Maternal antibody;Interference;Protection
期刊名称:VACCINE ( 影响因子:3.641; 五年影响因子:3.816 )
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年卷期:
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收录情况: SCI
摘要: Newcastle disease virus (NDV) recombinants expressing the infectious laryngotracheitis virus (ILTV) glycoproteins B and D have previously been demonstrated to confer complete clinical protection against virulent ILTV and NDV challenges in naive chickens. We extended this study to assess whether maternally derived antibody (MDA) against NDV and ILTV would interfere with protection in vaccinated broiler chickens. Chickens with a mean NDV MDA hemagglutination inhibition (HI) titer of 6.4 (log(2)) and detectable ILTV neutralization (VN) antibodies at hatch were vaccinated with rLS/ILTV-gB or rLS/ILTV-gD at 1 or 10 day of age (DOA) or on both days. Groups of birds vaccinated with the commercial ILT vaccines (FP LT and CEO) or sham inoculated were also included in this study. All vaccinated birds were challenged with virulent ILTV strain at 21 DOA. By that time, NDV HI titers declined to 2.6 (log(2)) in unvaccinated birds, whereas the HI titers in NDV vectored vaccine groups increased to 3.5-6.3 (log(2)). At standard dosages, both vaccine candidates conferred significant clinical protection; however, the protection elicited by the rLS/ILTV-gD was superior to that of rLS/ILTV-gB. Recombinant rLS/ILTV-gD reduced ILTV shedding from tracheal and ocular tissues by approximately 3 log(10) TCID50. Notably, there was no improvement in protection after booster vaccination at 10 DOA. Overall results indicate that the presence of maternal antibodies to NDV and ILTV did not significantly interfere with the ability of the NDV LaSota strain-vectored ILTV gB and gD vaccine candidates to elicit protective immunity against infectious laryngotracheitis. Published by Elsevier Ltd.
分类号: R392
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