3.1 Clinical signs and post-mortem examinations
For both NDRV outbreaks, most diseased ducklings were characterized by
diarrhea, lethargy, increased eye discharge, loss of appetite, stunted
growth, and paralysis. Among the organs collected from the dead
ducklings in both cases, the predominant histologic lesions are located
in the liver and spleen. The livers (Figure 1a, 1b, 1c) and spleens
(Figure 1d, 1e, 1f) showed swelling, hemorrhage, and irregular necrosis
in all dead ducklings. And other
organs did not exhibit apparent lesions.