Bovine spongiform encephalopathy

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A cow unable to stand due to BSE.

Commonly known as “mad cow disease," bovine spongiform encephalopathy is a slowly progressive, incurable disease affecting the central nervous system of cattle, first diagnosed in the United Kingdom in 1986. BSE belongs to a family of diseases known as the transmissible spongiform encephalopathies (TSEs). Consumption by cattle of animal feed containing TSE-contaminated meat and bone meal has been cited as one possible means of transmission. Scientific evidence supports a causal relationship between BSE outbreaks in Europe and more than 170 recent European cases of a human TSE, variant Creutzfeldt-Jakob Disease (vCJD). TSE animal diseases are found in the United States, including scrapie in sheep and goats and chronic wasting disease in deer and elk. Since 1989, USDA has prohibited the importation of live ruminants from countries where BSE is known to exist in native cattle. In 1997, the Food and Drug Administration (FDA) prohibited the use of most mammalian protein in ruminant feeds. It is possible for this disease to spread asymptomatically. BSE has an incubation period of 5 years, but cows are slaughtered at 18 months. This results in asymptomatic transmission to humans."[1]

References

USDA Index