FIG 7.

Means of histopathological scores of lesions in trachea and kidney samples after 5 dpc from chickens experimentally challenged at 28 days of age with the Q1 strain of infectious bronchitis virus (n = 10 per group). The chickens were previously 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) kept as a control was inoculated with sterile water. Significant differences between the groups were detected by Kruskal-Wallis test followed by Dunn's mean test and are indicated with different letters (P < 0.05).