“…In the respiratory system, lung consolidation resulting from focal mononuclear cell infiltration, oedema, congestion, and haemorrhage can be observed (15,32). Livers of affected birds may show a dilatation of sinusoids with infiltration of mononuclear cells, lymphocytes, and heterophils (18,34). Histological examination of naturally infected imported parakeets showed focal necrosis of the liver with an infiltration of heterophils, macrophages, and plasma cells (34).…”