The effect of two infectious bursal disease virus (IBDV) vaccines (IBDV-immune complex [Icx] and IBDV-2512), administered in ovo, on the cell-mediated immunity of specific-pathogen-free (SPF) broilers was examined. A decrease (P < 0.05) in the T-cell mitogenic response occurred in birds vaccinated with both vaccines on days 9 and 21 post in ovo vaccination (PIOV), but an increase (P < 0.05) occurred on day 15 PIOV. The T cells from birds given the IBDV-2512 were less responsive. There were no significant differences in proportions of lymphocytes expressing CT4 CT8− and CT8 CT4− except on day 21 PIOV, where an increase (P < 0.05) in IBDV-2512–vaccinated birds and a decrease (P < 0.05) in percentage of CT4 CT8− in IBDV-Icx–vaccinated birds was observed. There was an increase (P < 0.05) in percentage of CT8 CT4− T cells on day 21 PIOV in both vaccinated groups. A decrease (P < 0.05) in B-cell percentage was observed on day 21 PIOV in birds given both vaccines. Results indicated that although humoral immunosuppression is associated with destruction of B cells (bursal atrophy), cell-mediated immunosuppression induced by these two IBDV vaccines in SPF birds was not associated with altered helper (CT4 CT8−) or cytotoxic (CT8 CT4−) subpopulations of T lymphocytes.
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Vol. 46 • No. 4