人类已经跨入21世纪,人们对营养与健康的要求也会越来越高.然而,近年来流行性疾病在世界范围内此起彼伏,先是欧美国家的疯牛病.口蹄疫,继后是世界局部地区的新型病毒--非典.去年底,非典个例在少数国家和地区再现,去年12月美国首例疯牛病出现,亚洲地区随之又出现了禽流感.接着我国广西隆安也发生了高致病性禽流感疫情.面 Humankind has stepped into the 21st century, people’s nutrition and health requirements will also be higher and higher.However, in recent years, epidemic diseases in the world one after another, first in Europe and the United States of mad cow disease.Fat-foot-and-mouth disease, followed by a new type of part of the world Virus-SARS .At the end of last year, SARS cases were reproduced in a few countries and regions. In December last year, the first case of mad cow disease appeared in the United States, followed by avian influenza in the Asian region. Epidemic situation