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
Animal studies of Natural History showed family groupings that conformed to the traditional human nuclear family, which misrepresented the animals' observed behavior in the wild. Critical approaches in animal studies have also considered representations of non-human animals in popular culture, including species diversity in animated films. By highlighting these issues, animal studies strives to re-examine traditional ethical, political, and epistemological categories in the context of a renewed attention to and respect for animal life. The assumption that focusing on animals might clarify human knowledge is neatly expressed in Claude Lévi-Strauss's famous dictum that animals are "good to think." Animal studies Animal studies