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Section of meninges with subjacent gray matter of muskellunge (Esox masquinongy) exposed at the medium dose (4 × 103 plaque forming units mL−1), 6 days post-infection. (a) Spongiosis (arrows), gliosis (arrowheads), and lymphocytic infiltrates within the gray matter and minimally into the meninges (asterisks). (b) Positive riboprobe staining in areas of necrosis (scale bar = 60 µm).
