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. 2022 Jun 25;50:101508. doi: 10.1016/j.eclinm.2022.101508

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© 2022 The Authors

This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

PMC Copyright notice

Fig 2 — Epidemic Curve of reported human polio cases globally, 01/01/2016 – 30/06/2021.

“WPV1” refers to wild poliovirus serotype 1, “cVDPV1” refers to circulating vaccine-derived poliovirus serotype 1, “cVDPV2” refers to circulating vaccine-derived poliovirus serotype 2, “cVDPV3” refers to circulating vaccine-derived poliovirus serotype 3, and “cVDPV2&3” refers to a case where both cVDPV2 and cVDPV3 were isolated from a single individual. Colours represent the serotype of poliovirus reported: WPV1 (orange), cVDPV1 (yellow), cVDPV2 (green), cVDPV3 (blue), and cVDPV2&3 (brown).

*There was a reporting gap from ProMed between March and December 2020; retrospectively, a total of 3 cVDPV1 and 684 cVDPV2 AFP cases were reported in this period.