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Histopathological examination of the corneal lesion. a) Gram staining demonstrated Gram-positive cocci. Hemorrhage and infiltration of polymorphonuclear neutrophils were observed in the stroma. b) Immunohistochemical staining with a monoclonal anti-Staphylococcus aureus antibody revealed Gram-positive cocci and the cytoplasm of the polymorphonuclear neutrophils to be positive.
