Fowl Pox is a common viral disease of commercial poultry, especially chickens and turkeys. Pox infections can be easily recognised, typically causing cutaneous lesions on the unfeathered skin of the head, neck, legs and feet, lesions in the nares and conjunctivae, leading to nasal discharge and blindness. A second form of the disease, known as diphtheritic form (or wet pox), causes lesions in the mouth, larynx, trachea, oesophagus, leading to inappetence and difficulty in breathing.

Pox is a cutaneous virus, therefore the vaccines have to be applied via the skin either by wing web application or by the follicle method.

An outbreak of Avian Pox propagates rather slowly inside a chicken house. Pox vaccines therefore can be administered as soon as an outbreak is detected, but not when birds are already into egg production. If vaccination is done facing an installed outbreak, it should be started in the opposite extreme of the chicken house to where the first affected birds have been observed. This is to allow the birds the largest possible time to develop immunity against the disease.

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