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Histopathological examinations of cecal tissues from broilers with or without the challenge of Salmonella Typhimurium (ST) by haematoxylin and eosin staining. (A) Control group; (B) 0% Treh + ST group; (C) 1% Treh + ST group; (D) 3% Treh + ST group; (E) 5% Treh + ST group. The scales were shown in 20 μm (400×), 100 μm (100×), and 200 μm (40×). The infiltration of immune cells was indicated by the black arrow.
