FIG 5.

Summary of CD4⁺ cells (a), CD8⁺ cells (b), and IgA-secreting cells (c) determined by immunohistochemical staining in the 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. One group (group III) was kept as a control. Depicted are the mean values (n = 5 per group) and one standard error. Significantly (P < 0.05) different values are shown with different letters, and all other values were not significantly (P < 0.05) different between the groups at those time points.