Fig. 4

Histopathological changes in the GPV-inoculated Shaoxing ducklings at 6 days PI. Con and Ino represent the control and Inoculated groups, respectively. a, b, c, d, i, j, k, l, q, r, and s Brain, bursa of Fabricius, lung, spleen, trachea, kidney, thymus, pancreas, and different parts of the heart, respectively in the control group. e Brain. h Spleen. n Kidney. p Pancreas. f lymphocytes in bursa mildly decreased. g Small pulmonary veins wall degenerated. m A few lymphocytes in trachea submucosa infiltration. o thymic hemorrhage. t a large number of lymphocytes infiltrated in small cardiac veins. u bleeding in myocardiac fibers. v epicardium hemorrhage. Magnification is 200 ×