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(a) Histology of the gills from CEV-infected fish showing the secondary lamellae edema with lifting of the epithelium (asterisks) and proliferation of cells in the intralamellar spaces. (b) In situ hybridization detecting CEV DNA in infected gills; dark blue signal (arrow) indicates CEV-infected cells. ILCM: intralamellar cellular mass, PL: primary lamella of the gill, SL: secondary lamella. Bar 50 µm
