Fig. 5From: Analysis of vaccination campaign effectiveness and population immunity to support and sustain polio elimination in NigeriaNorthern state reconstructed population immunity. (a, b) Average type 1 (a) and type 2 (b) population immunity for northern states, shaded region represents pointwise 95 % credible interval. (c, d) Estimate district-level type 1 (c) and type 2 (d) population immunity as of December 31st, 2014Back to article page