First Detection and Molecular Characterisation of Pseudocowpox Virus in a Cattle Herd in Zambia

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Abstract Background: Pseudocowpox virus (PCPV) of the genus Parapoxvirus in the family Poxviridae causes pseudocowpox in cattle worldwide and presents a zoonotic concern. Most poxviruses produce diseases of similar clinical signs in affected animals, which are impossible to differentiate clinically or by serology. It is, therefore, vital to use molecular assays to identify the causative agents of poxvirus infections rapidly. This study aimed to detect, diagnose, and characterize the causative agent of pox-like skin lesions in a cattle herd in Zambia, initially suspected to be infected with the Lumpy Skin Disease virus.Methods: We used a high resolution melting (HRM) analysis assay to detect the PCPV genome and sequenced the major envelope protein (B2L) gene for comparative sequence and phylogenetic analysis. Results: Our field investigations showed cattle presenting atypical skin lesions and high morbidity within the herd. The laboratory diagnosis based on an HRM assay revealed the PCPV genome in the samples. Phylogenetic and comparative sequence analyses confirmed PCPV in the samples. They revealed genomic differences between samples collected in 2017 and 2018 from the same farm.Conclusion: Our work is the first documented report of PCPV in Zambia. It shows the strength of molecular methods to diagnose pox-like infections in cattle and discriminate between diseases causing similar clinical signs for better veterinary interventions.

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