Vitamin A interventions have contributed to the reduction in under-five mortality rates and to progress toward the child survival Millennium Development Goal. Globally, twice-yearly vitamin A supplementation (VAS) remains the most prominent public health strategy for controlling vitamin A deficiency-related mortality and xerophthalmia.1 In 2010, there were limited data to assess VAS programs in sub-Saharan Africa other than administrative tally sheets, which often reported coverage over 100%. Neither the true coverage nor the implementation quality of the programs was known. To fill this information gap, Helen Keller International (HKI), in collaboration with host governments, began implementing post-event coverage surveys (PECS) to validate coverage estimates and generate data about the quality of program implementation. This article presents the rationale for conducting PECS, the survey content and methodology, HKI’s innovations using mobile devices and experiences applying findings to improve VAS program performance.
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