Poliovirus seroprevalence before and after interruption of poliovirus transmission in Kano State, Nigeria.

•Polio seroprevalence surveys help measure progress towards polio eradication.•Nigeria program conducted multiple seroprevalence surveys in northern states.•This article covers seroprevalence survey in Kano Nigeria in 2013 and 2014.•Data represents levels before and after the interruption of poliovirus transmission.•Significant improvement in seroprevalence in 2014 over 2013, but gaps continue.•Good participation even by vaccine refusers in this health facility based project.