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Pathological changes of viscera and organs in chickens infected with Salmonella pullorum. (A) Liver of normal chickens; (B) spleen of normal chickens; (C) duodenum of normal chickens; (D) liver of protected chickens; (E) spleen of protected chickens; (F) duodenum of protected chickens; (G) liver of chickens with pathological changes; (H) spleen of chickens with pathological changes; (I) duodenum of chickens with pathological changes.
