SUMMARY. The present case is an exceptional report of cutaneous fowlpox with an atypical appearance and incidence in broilers. Gross skin lesions were noticed in 41-day-old commercial broilers during the veterinary inspection at the processing plant, in the north of Iran. The skin lesions were only observed on feathered skin areas of the broilers and remained unnoticed until slaughter. Round, nodular or coalescent, elongated reddish-brown proliferative lesions, were mainly located on the back, thighs and proximal areas of the neck of broilers. Non-feathered skin, including the wattle, comb, eyelids and legs, were not affected. This condition incurred high losses due to a 5.3% condemnation rate and trimming of carcasses. Cutaneous lesions were sampled for histopathology and molecular virology for further investigations. Histopathology revealed multifocal necrotic dermatitis with epidermal eosinophilic cytoplasmic inclusion bodies in the skin lesions. Molecular investigations confirmed the presence of fowlpox virus (FWPV) in the proliferative lesions with further investigations identifying two FWPV genome populations, one carrying a portion of the reticuloendotheliosis virus (REV) and other the nearly complete REV provirus. Furthermore, 4b core protein gene based molecular analysis clustered the field virus into the clade A of the genus Avipoxvirus .

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