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Gross pathological changes in lungs of NDV infected chickens. Lungs of control chickens showing normal appearance (a). Lungs of infected chickens showing congestion, hemorrhage and consolidation with traces of fibrin at 24 hpi (b), gradual paleness and reduction in size of lungs at 2 dpi (c) and 3 dpi (d), and severe congestion, hemorrhage, and gradual shrinking of lungs at 4 dpi (e) and 5 dpi (f).
