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JSRV is the virus that is the cause of the contagious lung tumors in sheep called ovine pulmonary adenocarcinoma (OPA). The disease has also been called "jaagsiekte", after the Afrikaans words for "chase" (jaag) and "sickness" (siekte), to describe the respiratory distress observed in an animal out of breath from being chased, indicating the breathing difficulty experienced by infected sheep.
Ovine pulmonary adenocarcinoma (OPA), also known as ovine pulmonary adenomatosis, or jaagsiekte, is a chronic and contagious disease of the lungs of sheep and goats. OPA is caused by a retrovirus called jaagsiekte sheep retrovirus (JSRV).
Jaagsiekte sheep retrovirus; M. Mason-Pfizer monkey virus; Mouse mammary tumor virus This page was last edited on 10 August 2023, at 16:54 (UTC). ...
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. [citation needed]
Sheep and goats are both small ruminants with cosmopolitan distributions due to their being kept historically and in modern times as grazers both individually and in herds in return for their production of milk, wool, and meat. [1]
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First described in 1954 by Bjorn Sigurdsson in Iceland, [6] Maedi-visna virus was the first lentivirus to be isolated and characterized, accomplished in 1957 by Sigurdsson. [6] [7] [8] Maedi (Icelandic mæði 'dyspnoea') and visna (Icelandic visna 'wasting' [9] or 'shrinking' of the spinal cord) refer to endemic sheep herd conditions that were only found to be related after Sigurdsson's work.
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