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Immunohistochemical detection of CD4+ cells in group II at 28 days of age (B), CD8+ cells in group II at 28 days of age (C), and IgA-bearing B cells in group II at 28 days of age (D) in tracheas of chickens vaccinated with live H120 alone (group I) or in combination with CR88 (group II) at day 1. The two groups were again vaccinated with CR88 at 14 days of age. (A) One group (group III) was kept as a control. Magnification, ×400. Arrows indicate positive cells.
