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→Diagnosis
On '''post-mortem, petechial haemorrhage in the conjunctivae, mucous membranes, trachea, syrinx and intestine are pathognomonic for DEV.''' This pathology is caused by '''increased vascular permeability'''.<ref name ="Richter">Richter, J. H. M., Horzinek, M. C (1993) '''Duck plague'''. Virus infections of birds.77-90;35</ref> In advanced disease, the same sites may become covered by '''yellow-white necrotic plaques''', sometimes forming pseudomembranes in the cloaca and oesophagus.<ref name="Richter" />
On '''post-mortem, petechial haemorrhage in the conjunctivae, mucous membranes, trachea, syrinx and intestine are pathognomonic for DEV.''' This pathology is caused by '''increased vascular permeability'''.<ref name ="Richter">Richter, J. H. M., Horzinek, M. C (1993) '''Duck plague'''. Virus infections of birds.77-90;35</ref> In advanced disease, the same sites may become covered by '''yellow-white necrotic plaques''', sometimes forming pseudomembranes in the cloaca and oesophagus.<ref name="Richter" />
In young birds, these pathological changes are often associated with the '''[[Regional Lymphoid Tissue - Anatomy & Physiology#Structure|gut-associated lymphoid tissue (GALT)]]'''.
In young birds, these pathological changes are often associated with the '''[[Regional Lymphoid Tissue - Anatomy & Physiology#Structure|gut-associated lymphoid tissue (GALT)]]'''.