Figure 1.

Ciliostasis protection scores among tracheas collected 5 days post-challenge with IBV GA98 for different groups of birds challenged at 20, 24, 28, 32, and 36 weeks of age (WOA). Groups with a protection score >50 (horizontal line) are protected, and groups with a protection score <50 are not protected. Fractions above each bar represent the proportion of birds positive for ciliostasis for the respective group. −/− = non-vaccinated/non-challenged, +/− = vaccinated/non-challenged, +/+ = vaccinated/challenged, −/+ = non-vaccinated/challenged.