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 cracker popular, the Austin variety has similar nutritional content and animal shapes. The Austin product is labeled under the name of the Kellogg Company, which acquired Keebler in 2001. Stauffer Biscuit Company of York, Pennsylvania, also has a line of animal crackers, which are now distributed by several major discount retailers. Their use of the spices nutmeg and mace give the basic animal cracker a slightly different character from the Nabisco crackers. The Borden corporation also produced a brand of animal crackers, until the late 1970s. They came in a red box, which featured the famous Elsie the Cow logo. Market