Avian poxviruses are distributed worldwide in poultry, pet birds and wild birds. The incidence of fowlpox in domestic poultry is variable in different geographical regions because of differences in management practices, hygienic conditions and the use of prophylactic immunization. Avian poxviruses have been considered to be population limiting factors in some Hawaiian forest birds. In some areas the disease is usually more common during summer months when the mosquito population is high. However, in large poultry operations, especially in multiple age complexes, it may occur at any time of the year.
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