Figure 3.

Proportion of wards with updated microplans in 11 Nigerian states at high risk for polio transmission, 2010–2015. For the purpose of this analysis, the March immunization round is selected for each year because the major microplan activities are conducted throughout the country. The slight reduction in 2015 is attributed mainly to a low level of microplanning activities in Borno state, owing to the inaccessibility of wards in a number of local government areas for security reasons. Source: World Health Organization, Nigeria Country Office, Abuja.