Fig. 2

Histopathological analysis of the pathogenicity of QX and Mass-type IBV in the oviduct 4 days post infection. A1–D1 Different segments of oviduct in the control group. A2 Infundibulum of the QXL group, black arrows indicate macrophages and lymphocytes distributed in the connective tissue in the lamina propria, white arrows indicate the expansion of tubular glands. B2 Magnum of the QXL group, white arrows indicate the expansion of tubular glands. C2 Isthmus of the QXL group, black arrows indicate lymphocytes infiltrating the interstitium of the lamina propria. D2 Uterus of the QXL group, white arrows indicate interstitial dilation. C3 Isthmus of the M41 group, white arrows indicate the desquamation of epithelial cells. D3 Uterus of the M41 group, white arrows indicate the desquamation of epithelial cells. Scale bars: 50 μm. E, mucosal epithelium; L, lumen; LP, lamina propria