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Betaretrovirus is a genus of the Retroviridae family. It has type B or type D morphology. The type B is common for a few exogenous, vertically transmitted and endogenous viruses of mice; some primate and sheep viruses are the type D.

Virus classification e
(unranked): Virus
Phylum: incertae sedis
Class: incertae sedis
Order: Ortervirales
Family: Retroviridae
Subfamily: Orthoretrovirinae
Genus: Betaretrovirus
Type species
Mouse mammary tumor virus

Examples are Mouse mammary tumor virus, enzootic nasal tumour virus (ENTV-1, ENTV-2), and simian retrovirus types 1, 2 and 3 (SRV-1, SRV-2, SRV-3).[1]


  1. ^ Philipp-Staheli J, Marquardt T, Thouless ME, Bruce AG, Grant RF, Tsai CC, Rose TM (March 6, 2006). "Genetic variability of the envelope gene of Type D simian retrovirus-2 (SRV-2) subtypes associated with SAIDS-related retroperitoneal fibromatosis in different macaque species". Virol J. 3: 11. doi:10.1186/1743-422X-3-11. PMC 1450265. PMID 16515713.

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