Jaagsiekte sheep retrovirus Jaagsiekte sheep retrovirus Jaagsiekte sheep retrovirus (JSRV) is a betaretrovirus which is the causative agent of a contagious lung cancer in sheep, called ovine pulmonary adenocarcinoma. 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. Transmission of virus is through aerosol spread between sheep. The exogenous infectious form of
Set animal the head of a donkey, it is possible the donkey was the inspiration for the Set animal. Others have speculated that it is a purely fantastic or composite animal, which never existed in nature; this was the opinion of Egyptologist E. A. Wallis Budge. Because the name "sha" is not as familiar as that of Set, and has no independent mythology associated with it, the animal is commonly referred to as "Set" or "Set animal" or the "Typhonian animal", so-called because the Greeks equated Set or Sutekh with the monster Typhon. Set animal In ancient Egyptian art, the Set animal,