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Histopathological changes in the brain of NDV infected chickens. Section of the brain of control chickens showing normal architecture (a). Sections of brains of infected chickens showing focal meningitis at 2 dpi (b), diffuse meningitis with encephalomalacia at 3 dpi (c) and diffuse meningoencephalitis with encephalomalacia at 5 dpi (d). H&E stain, bar indicates magnification.
