Formerly a subfamily of viruses (family Retroviridae) that includes the foamy viruses (agents) of primates and other mammals; they are now placed in the genus Spumavirus. In common with other retroviruses, they possess RNA-dependent DNA polymerases (reverse transcriptase).
[L. spuma, foam]
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FVs belong to the Spumavirinae retroviral subfamily and are known as nonpathogenic retroviral species, which are endemic to a number of mammalians such as non-human primates, cats, and cows [10].