198 8～ 1993年在埃及的 2 7个行政区中的 8个行政区发现了 3 2例与口服脊髓灰质炎 (脊灰 )疫苗 (ＯＰＶ)Ⅱ型衍生病毒有关的病例。虽然最初的分离检测表明 ,它们和疫苗株有不同的成分和不同的核苷酸序列 ,但核苷酸分析表明 :1999年所有的病毒分离结果 (核苷酸序列同源性为 93 198 8-3 In 1993, 8 out of 27 administrative districts in Egypt found 32 cases associated with oral poliovirus type 2 (OPV) virus. Although the initial isolation tests showed that they had different compositions and different nucleotide sequences than the vaccine strain, nucleotide analysis showed that all virus isolates in 1999 (nucleotide sequence homology 93