In Chad, averages of 3–4 campaigns are conducted per year targeting the whole country and typically included the integration of vitamin A supplementation twice per year. An estimated 3.5% of the Chadian population is nomadic [9], with children that can be difficult to reach for immunization. Chad therefore worked to specifically target polio campaigns and thereby vitamin A supple- mentation in nomadic children by tracking nomadic movements. The authorities agreed on flexible dates of campaigns with local leaders and chiefs, and worked in collaboration with them to ensure adequate awareness-raising in those communities [9].
With regard to data collection and reporting in all five countries, vaccinators and supervisors ensured that data for both interventions were recorded and underwent daily synthesis. Refusals and adverse events were documented and managed and health care workers were supervised and their work monitored. In Togo, it was specifically noted that activities included daily meetings during the campaign for monitoring and oversight [10].