Figure 2. Pathology of a duck infected with A/chicken/Yamaguchi/7/2004. A) Electron microscopy of the feather epidermis showing virions observed between epidermal cells with the desmosome (d) and nucleus (n). Bar = 500 nm. B) Spherical virion with envelope spikes. Bar = 100 nm. C) Budding process of virion (arrowhead). Bar = 250 nm.