Ghiselli Margherita E, Wilson Idongesit Nta, Kaplan Brian, Waziri Ndadilnasiya Endie, Sule Adamu, Ayanleke Halimatu Bolatito, Namalam Faruk, Tambuwal Shehu Ahmad, Aliyu Nuruddeen, Kadi Umar, Bolu Omotayo, Barau Nyampa, Yahaya Mohammed, Ugbenyo Gideon, Osigwe Ugochukwu, Oguji Clara, Usifoh Nnamdi, Seaman Vincent
U.S. Centers for Disease Control and Prevention (CDC), Atlanta, GA 30333, USA;
National Stop Transmission of Polio (NSTOP), Asokoro, Abuja 900231, Nigeria;
Data (Basel). 2019;4(1):20. doi: 10.3390/data4010020. Epub 2019 Jan 25.
Routine immunization coverage in Nigeria is suboptimal. In the northwestern state of Sokoto, an independent population-based survey for 2016 found immunization coverage with the third dose of Pentavalent vaccine to be 3%, whereas administrative coverage in 2016 was reported to be 69%. One possibility driving this large discrepancy is that administrative coverage is calculated using an under-estimated target population. Official population projections from the 2006 Census are based on state-specific standard population growth rates. Immunization target population estimates from other sources have not been independently validated. We conducted a micro-census in Magarya ward, Wurno Local Government Area of Sokoto state to obtain an accurate count of the total population living in the ward, and to compare these results with other sources of denominator data. We developed a precise micro-plan using satellite imagery, and used the navigation tool EpiSample v1 in the field to guide teams to each building, without duplications or omissions. The particular characteristics of the selected ward underscore the importance of using standardized shape files to draw precise boundaries for enumeration micro-plans. While the use of this methodology did not resolve the discrepancy between independent and administrative vaccination coverage rates, a simplified application can better define the target population for routine immunization services and estimate the number of children still unprotected from vaccine-preventable diseases.
尼日利亚的常规免疫接种覆盖率未达最佳水平。在西北部的索科托州，一项针对2016年的独立人群调查发现，五价疫苗第三剂的免疫接种覆盖率为3%，而2016年的行政覆盖率据报为69%。造成这一巨大差异的一种可能原因是，行政覆盖率是使用低估的目标人群计算得出的。2006年人口普查的官方人口预测是基于各州特定的标准人口增长率。其他来源的免疫接种目标人群估计数尚未得到独立验证。我们在索科托州乌尔诺地方政府辖区的马加里亚区进行了一次微观人口普查，以准确统计该地区的总人口，并将这些结果与其他分母数据来源进行比较。我们利用卫星图像制定了精确的微观计划，并在实地使用导航工具EpiSample v1引导各小组前往每栋建筑，做到不重不漏。所选区域的特殊特征凸显了使用标准化形状文件为枚举微观计划划定精确边界的重要性。虽然使用这种方法并未解决独立接种覆盖率与行政接种覆盖率之间的差异，但一个简化应用程序可以更好地界定常规免疫服务的目标人群，并估计仍未受到疫苗可预防疾病保护的儿童数量。
