منابع مشابه
To kill or not to kill: the eradication of contagious bovine pleuro-pneumonia in western Europe.
The use of slaughter or "stamping-out" programmes has been a consistent feature of public animal health strategies, in Western Europe at least, for some three centuries to the present date. Originally developed in the early eighteenth century, the concept survived the explosion of veterinary scientific knowledge and capacity from the late nineteenth century onwards. Its importance has been main...
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BACKGROUND Contagious Bovine Pleuropneumonia (CBPP) is the most important chronic pulmonary disease of cattle on the African continent causing severe economic losses. The disease, caused by infection with Mycoplasma mycoides subsp. mycoides is transmitted by animal contact and develops slowly into a chronic form preventing an early clinical diagnosis. Because available vaccines confer a low pro...
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Although cancer can on occasion be caused by infectious agents such as specific bacteria, parasites, and viruses, it is not generally considered a transmissible disease. In rare circumstances, however, direct communication from one host to another has been documented. The Tasmanian devil is now threatened with extinction in the wild because of a fatal transmissible cancer, devil facial tumor di...
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We consider the following activation process in d-regular undirected graphs: a vertex is active either if it belongs to a set of initially activated vertices or if at some point it has at least r active neighbors, where 1 < r ≤ d is the activation threshold. Such processes have been studied extensively in several fields such as combinatorics, computer science, probability and statistical physic...
متن کاملContagious Adverse Selection
We illustrate the corrosive e¤ect of even small amounts of adverse selection in an asset market and how it can lead to the total breakdown of trade. The problem is the failure of market con dence, de ned as approximate common knowledge of an upper bound on expected losses. Small probability events can unravel market con dence. We discuss the role of contagious adverse selection and the proble...
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ژورنال
عنوان ژورنال: BMJ
سال: 1886
ISSN: 0959-8138,1468-5833
DOI: 10.1136/bmj.1.1324.924