By what was mad cow disease caused and spread?

By what was mad cow disease caused and spread?
The full name of mad cow disease is " bovine spongiform encephalopathy " ,It is a kind of going on central nervous system pathological change happening on ox, symptom is similar to sheep's pruritus, is commonly called as " mad cow disease " . Cause the son's real properties of disease reason of mad cow disease and sheep's pruritus not to be so obvious at present, but the most approved theory is to name " prion " by one kind at present Lasting one that making a variation and causing, called into " the sons of cause of disease of ox crazy " . The crazy ox's something small and hard of cause of disease is not cell and virus, not also a parasite, can prevent and kill all general measures of infective bacterium, virus and can't kill " crazy ox's something small and hard of cause of disease " effectively at present ,All too world-wide to there is not a method to examine to the crazy ox's something small and hard of cause of disease directly yet at present. The spread of mad cow disease was considered to be through feeding the bone meal of animal's meat to spread for oxen, this kind has already been generally adopted by way of feeding bone meal of meat and offering livestocks a protein decades. In the latter stage of the seventies of the 20th century, some changes took place in the making course of the bone meal of animal's meat, one kind of assumptions thinks, it is the surviving that the change of such refined course has caused the something small and hard of cause of disease of sheep's pruritus, and through raising oxen and transmitting the something small and hard of cause of disease of sheep's pruritus to oxen with the bone meal of meat. By July of 2000, more than 176000 oxen of over 34000 pieces of pasture have been infected with this disease in Britain, time was in January of 1993 to have illness coming on at most, 1000 oxen have illness coming on at least every month. Mad cow disease take place until Britain most many, count, account for, have illness coming on 99% that count always 1999, find native mad cow disease in the other European countries too afterwards.

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