１９９３年全球脊髓灰质炎一、接种率：据估计１９９３年３次ＯＰＶ的接种率为８１％，自１９９０年接种率达８５％以后，接种率又有所下降。下降原因包括捐助机构和一些国家减少对免疫工作的支持。二、脊灰发病情况：由于免疫接种率提高和消灭脊灰的专门行动，自１９８８... Global Poliomyelitis, 1993 I. Vaccination rates: It is estimated that the vaccination rate of OPV was 81% in 1993 and the inoculation rate dropped after 85% in 1990. Reasons for the decline include donor agencies and some countries reducing their support for immunization efforts. Second, the incidence of polio: Due to increased immunization rates and the eradication of polio special operations, since 1988 ...