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Studies were performed to determine if passive immunization with hyperimmune sera generated to specific Newcastle disease virus (NDV) proteins conferred protection against virus challenge. Six groups of 3-wk-old chickens were passively immunized with antiserum against either hemagglutinin-neuraminid...
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Cyclophosphamide (CY) was injected in ovo on the 16th, 17th and 18th days of incubation. Blood samples were collected periodically from CY-treated and non-treated birds after hatch and were used to measure blood lymphocyte responses to the T-cell and B-cell mitogens, concanavalin A and lipopolysacch...
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The fluorescent antibody (FA) assay was developed for detecting the stunting syndrome agent (SSA) from intestinal tissue. Similarly, the indirect fluorescent antibody (IFA) assay was developed for detecting serum antibodies to SSA. Convalescent antiserum from turkeys orally immunized with SSA was fo...
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Five continuous cell lines, swine testicular (ST), human rectal tumour (HRT 18), fetal rhesus monkey kidney (MA104), bovine turbinate (BT), and quail tracheal (QT35), were evaluated and compared with chick embryo fibroblasts (CEFs) for their ability to propagate B1 or Texas GB strains of Newcastle d...
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Conventional nested and TaqMan reverse transcription-polymerase chain reaction (RT-PCR) assays for the detection of avian pneumovirus (APV) were evaluated and compared with virus isolation (VI) for sensitivity and specificity. Respiratory tissues and tracheal swabs were collected from experimentally...
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The role of cell-mediated immunity (CMI) in protection of birds from Newcastle disease was investigated by two different strategies in which only Newcastle disease virus (NDV)-specific CMI was conveyed without neutralizing antibodies. In the first strategy, selected 3-wk-old specific-pathogen-free (...
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2, 21-day experiments were conducted to document the effects of early immunologic stress and changes in dietary MEn on selected characteristics of immune function of newly-hatched turkeys. Each experiment consisted of 8 treatments in a complete factorial arrangements of 2 injections and 4 isonitroge...
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Stunting syndrome is an enteric disease of young turkeys that results in reduced growth (stunting) of poults and impaired feed efficiency. A virus, which has been termed the stunting syndrome agent (SSA), causes stunting syndrome. In this study passive immunity was evaluated as a method of protectin...
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A reverse transcription-polymerase chain reaction (RT-PCR) assay for the detection of avian pneumovirus (APV), Colorado strain (US/CO), was evaluated for sensitivity and specificity. The single-tube RT-PCR assay utilized primers developed from the matrix (M) gene sequence of the US/CO APV. The RT-PC...
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