Abstract
Fowlpox virus (FPV), type species of the Avipoxvirus genus, causes a slow-spreading pox disease of chickens. Following infection of mammalian cells there is no evidence of productive replication of FPV although cytopathic effects are induced and FPV recombinants have been shown to express foreign genes from vaccinia virus early/late promoters. Here we report results of a study to investigate the expression of FPV genes, the replication of FPV genomic DNA, and any ultrastructural changes in mammalian cells infected by wild-type virus, undertaken as a first step in elucidating the nature of the block (or blocks) to productive replication of FPV in mammalian cells. Early and late gene expression as well as genomic DNA replication was observed in fibroblast-like cell lines of monkey and human origin. Furthermore, viral morphogenesis was observed in monkey cells, with the production mainly of immature particles though smaller numbers of apparently mature virus particles were observed.
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