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Pathological changes of chickens died at 55-day-old. (a) yellow degeneration diffusely in liver edge; (b) rough and uneven in liver surface; (c) bursa of Fabricius swelling; (d) muscular stomach swelling; (e) glandular stomach swelling; (f) lots of white diffused nodule in the swelled spleen; (g) kidney swelling and pale in color.
