Figure 3
From: The potential impact of expanding target age groups for polio immunization campaigns
![Figure 3](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2F1471-2334-14-45/MediaObjects/12879_2013_Article_3002_Fig3_HTML.jpg)
WPV1 incidence for expanded age group and other scenarios in northwestern Nigeria. Arrows indicate the time of elimination in the model for each scenario. (a) Hypothetical retrospective policy changes starting in 2012, (b) Prospective policy changes starting late 2013 or later.