Mark Purdey animal feed dates back to at least 1926. In the 1970s attention was directed within MAFF to the danger that this practice would result in the spread of infectious diseases. The diseases considered were those caused by conventional viral and bacterial organisms. No consideration appears to have been given to the risk that scrapie might be recycled in sheep, or even transmitted to other farm animals. This may seem surprising. The answer probably lies in the fact that half a century had elapsed without any indication that animal feed containing ovine protein was infecting sheep or any other animal." Purdey
Ovine rinderpest gene. Lineages I and II are found mainly in West Africa. Lineage III is generally found in East Africa. Lineage IV was long known as the Asian lineage, but has now spread to the African continent and become the most prevalent lineage of all. This virus appears to have evolved at the start of the 20th century in Nigeria. The extant genotypes subsequently appeared in West Africa (lineages I and II), East Africa and Arabia (lineage III), and Pakistan–India (lineage IV). The first description of the disease was published in 1942 and relates to an outbreak in Côte d’Ivoire, West