Researchers have appealed for new efforts to stop polio in countries where the disease never seems to disappear. They say stronger health systems and greater community involvement are needed in three such countries – Nigeria, Afghanistan and Pakistan. All three have faced attacks by militants, political unrest and a lack of trust among the populations. 研究人员呼吁在那些疫情不断的的国家做出新的努力以根除脊髓灰质炎.他们表示,在三个这类国家 -- 尼日利亚,阿富汗和巴基斯坦,需要有更强大的卫生系统和更深入的社区参与.这三个国家都面临着武装分子袭击、政治动乱,人们之间缺乏信任.
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