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The appearance and histopathology of the feet in healthy or foot pad dermatitis-affected duck breeders. A: the appearance of healthy or foot pad dermatitis (FPD)-affected feet, T-1 represents the FPD feet; C-1 represents the healthy feet. B: the histopathology of the FPD feet, 1 shows a large area of inflammatory cells infiltration (black arrow); 2 shows an area of cyst. C: the histology of the healthy feet, the section shows normal histology with few lymphocytes(2 black arrows).
