自1998年世界卫生大会决定在全球范围内消灭脊髓灰质炎(脊灰)以来,到2 0 0 2年脊灰流行国家已从12 5个减少到7个,估计脊灰发病率已下降99%。2 0 0 2年,欧洲区成为第三个世界卫生组织(WHO)证实无脊灰的区域,另外美洲区和西太平洋区分别在1994年和2 0 0 0年证实无脊灰。尽管取得 Since the World Health Assembly decided in 1998 to eradicate poliomyelitis (polio) globally, polio-endemic countries have been reduced from 125 to 7 countries by 2002, and the incidence of polio is estimated to have dropped by 99% . In 2002, the European region became the third WHO to prove polio-free. In addition, the Americas and the Western Pacific proved to be polio-free in 1994 and 2000 respectively. Despite the acquisition