Figure 7

IBV antigens were detected in tissues from infected groups by immunohistochemistry; black arrows indicate the viral antigens. A The epithelial cells of proventriculus tubules in the 1-day-old oral group (14 dpi). B Mucosal epithelium of the gizzard in the 1-day-old infected groups (7 dpi). C Renal tubular epithelial cells of the 1-day-old oral group (14 dpi). D Epithelial cells in the jejunum of the 1-day-old and 28-day-old ocular groups (7 dpi). E Epithelial cells in the ileum of the 1-day-old and 28-day-old ocular groups (7 dpi). F Epithelium cells in the rectum of the 1-day-old infected groups (7 dpi) and 28-day-old ocular group (7 dpi).