论文部分内容阅读
自从1988年倡议全球消灭脊髓灰质炎(脊灰)以来,脊灰报告病例数从每年约35万例减少到2008年的1655例。II型脊灰野病毒(Wild Poliovirus,WPVII)病例最后报告时间是1999年10月,除了4个国家(阿富
Since the initiative to eradicate poliomyelitis (polio) worldwide in 1988, the number of reported cases of polio decreased from about 350,000 cases per year to 1,655 in 2008. The last reported case of type II wild poliovirus (WPVII) was October 1999, except for four countries