Deltaretrovirus is a genus of the Retroviridae family. It consists of exogenous horizontally transmitted viruses found in several groups of mammals.
Examples are the Bovine leukemia virus and the human T-lymphotropic viruses.
https://en.wikipedia.org/wiki/Deltaretrovirus
Spumaretrovirinae, commonly called spumaviruses (spuma, Latin for "foam") or foamyviruses, is a subfamily of the Retroviridae family.[2] Spumaviruses are exogenous viruses that have specific morphology with prominent surface spikes. The virions contain significant amounts of double-stranded full-length DNA, and assembly is rather unusual in these viruses. Spumaviruses are unlike most enveloped viruses in that the envelope membrane is acquired by budding through the endoplasmic reticulum instead of the cytoplasmic membrane. Some spumaviruses, including the equine foamy virus (EFV), bud from the cytoplasmic membrane.
Some examples of these viruses are simian foamy virus and the human foamy virus.
While spumaviruses will form characteristic large vacuoles in their host cells while in vitro, there is no disease association in vivo.[3]
https://en.wikipedia.org/wiki/Spumaretrovirinae
Soon after BLV was discovered in the 1970s, ten studies were done looking for antibodies to BLV in humans. However, no antibodies were found and so researchers concluded that BLV was not a risk to human health.[8] However, more sensitive techniques for detecting antibodies were developed, and in 2003 a test of more than 200 people using these new tests found that more than a third carried antibodies reactive to BLV, and the question began to be researched again.[9]
Rabbits get a fatal AIDS-like disease similar to Pasteurella, different from the benign human snuffles.
https://en.wikipedia.org/wiki/Bovine_leukemia_virus
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