Abstract
The cellular response to conjunctival vaccination with the Hitchner B1 strain of Newcastle disease virus was studied in the Harderian gland (HG) by immunohistochemistry. Bu-1+ cells and all subpopulations of T cells, (CD3+, CD4+, CD8+, TCR gamma delta, TCR alpha beta 1, and TCR alpha beta 2) were in the interstitial tissue between the ducts and the acini. Plasma cells with cytoplasmic IgM were more dispersed than the other cells and outlined the acini. Bu-1+ cells and all subpopulations of T cells increased at least three-fold after vaccination when compared to uninfected birds on the basis of the average cell counts in sections taken at 3, 5, 7, 10, 14, and 20 days after vaccination. The most marked increase was in the CD8+ cells which increased six-fold. Virus replicated for 10 days in cyclophosphamide (Cy) treated birds and for 7 days in cyclosporin A (CsA) treated birds compared with 5 days in untreated birds. Cy treatment prevented an antibody response to NDV and reduced Bu-1+ and IgM cells in the HG by 20-fold. Cy treatment resulted in a doubling of the number of T cells in the HG but these T cells may have been transiently disabled because it also caused a poor response of the lymphocytes in whole blood to the T cell mit...Continue Reading
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