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Fowl pox is a common and economically important disease of layers, causing drops in egg production and increased mortality.The disease is a slow-spreading one, characterised by the development of skin lesions on the unfeathered skin of the head, neck, legs and feet (dry pox).The diptheritic (wet pox) lesions are associated with the upper digestive and respiratory tracts, especially the larynx and trachea. Wet pox is the more serious form of the disease, with higher mortality in flocks.Wet pox alone can cause high mortality of up to 50–60 per cent in unvaccinated flocks. In layers, the disease causes a drop in egg production and reduces growth and development in young chicks and pullets.
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