这些国家还应当继续提高脊灰常规免疫覆盖率，以进一步加强人口免疫并且尽量减少疾病输入的风险。
Countries should also continue to boost routine immunization coverage against polio to further strengthen population immunity and minimize the risk of any importation.
2010年，欧洲区域在获得认证后发生第一例输入性脊灰病例。
In 2010, the European Region suffered its first importation of polio after certification.
2011年，世卫组织西太平洋区域也发生一例输入性脊灰病例。
In 2011, the WHO Western Pacific Region also suffered an importation of poliovirus.
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