Sub-national modelling of surveillance sensitivity to inform declaration of disease elimination: A retrospective validation against the elimination of wild poliovirus in Nigeria
Fig 2
Detections of wild poliovirus serotype 1 (WPV1) among cases of(A) AFP and (B) environmental surveillance (ES) samples. The total number of environmental samples collected is indicated by unfilled blue squares. (C) The recorded locations of four WPV1-positive cases of AFP detected in Borno state in July 2016, after 23 months of surveillance without detection (AFP cases are plotted randomly within LGA boundaries). Administrative boundaries are sourced from the Office for the Surveyor General of the Federation of Nigeria (OSGOF), Ehealth, United Nations Cartographic Section (UNCS) via the Humanitarian Data Exchange (https://data.humdata.org/dataset/cod-ab-nga), made available under the CC-BY-IGO license.