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Hematoxylin & eosin and immunohistochemical staining for African swine fever phosphoprotein p30 in tonsils. The inset show African swine fever virus-positive cell. No remarkable changes were noticed in the tonsils of case no. 4 (a). Positive staining of mononuclear cells was detected in apposition to the tonsillar crypt in case no. 4 (b).
