Figure 6

Histopathologic changes detected in different tissues in the 1-day-old groups. A–E tissues in the negative group (7 dpi). F–J tissues in the oral group. K–O tissues in the ocular group. F and K black arrows indicate inflammatory cellular infiltration in the trachea. The empty triangles indicate upper mucosa necrosis at different degrees (7 and 14 dpi). G and L black arrows indicate necrotic and exfoliated cells in the horn-like structure of the gizzard. The empty triangles indicate that the mucosal epithelium is moderately or seriously denatured and necrotic (7 dpi). H and M black arrows indicate inflammatory cellular infiltration in the kidney. The empty triangles indicate that the renal tubules were mildly to moderately denatured (7 and 14 dpi). I and N black arrows indicate a mild decrease in the number and volume of lymphocytes in the bursa (7 dpi). J and O The empty circles indicate mildly to moderately reduced goblet cells in the rectum (7 dpi).