WHO urges all countries to maintain and strengthen AFP surveillance and high population immunity.
世卫组织敦促所有国家保持和加强急性弛缓性麻痹的监测和人群的高免疫率。
The overriding priority is to urgently stop the WPV3 outbreak, while maintaining high population immunity across west Africa to WPV1.
目前的重中之重就是在西非的野生1型脊灰病毒人群免疫仍维持在较高水平时，紧急阻止野生3型脊灰病毒的暴发流行。
The rise in cases underlines the urgent need to conduct high-quality immunization campaigns to rapidly boost population immunity levels.
病例的增加强调了迫切需要开展高质量的免疫运动以便迅速增强人群免疫水平。
Countries should also continue to boost routine immunization coverage against polio to further strengthen population immunity and minimize the risk of any importation.
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。
Influenza pandemics can have an even bigger impact in the wider population, including younger age groups, because of a lack of population immunity to the new strain.
由于人们缺乏对新毒株的免疫力，流感大流行会对包括年轻人群在内的更广泛人群产生甚至更大的影响3,4。
Gaps in population immunity and primary failures in immunization were principle factors leading to measles infection and epidemic in Loudi City.
免疫空白人群和原始免疫失败为本市麻疹感染发病的主要影响因素。
The number of yellow fever cases has increased over the past two decades due to declining population immunity to infection, deforestation, urbanization, population movements and climate change.
在过去二十年中，由于人群对疾病感染的免疫力下降、砍伐森林、城市化、人口流动和气候变化等因素的影响，黄热病病例数呈增加趋势。
The number of yellow fever cases has increased over the past two decades due to declining population immunity to infection, deforestation, urbanization, population movements and climate change.
在过去二十年中，由于人群对疾病感染的免疫力下降、砍伐森林、城市化、人口流动和气候变化等因素的影响，黄热病病例数呈增加趋势。
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