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. 2021 Sep 25;41:A93–A104. doi: 10.1016/j.vaccine.2021.09.037

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Since January 2020 Elsevier has created a COVID-19 resource centre with free information in English and Mandarin on the novel coronavirus COVID-19. The COVID-19 resource centre is hosted on Elsevier Connect, the company's public news and information website. Elsevier hereby grants permission to make all its COVID-19-related research that is available on the COVID-19 resource centre - including this research content - immediately available in PubMed Central and other publicly funded repositories, such as the WHO COVID database with rights for unrestricted research re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for free by Elsevier for as long as the COVID-19 resource centre remains active.

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Fig. 6 — Risk of emergence and spread of reverted Sabin-2 from proposed SIA response (based on modest reduction in transmission between March-June 2020). (A) Proportion of districts with any (i.e. > 0) and > 100 reverted Sabin-2 infections over time under proposed response, reduced SIA coverage, and without NIDs. (B) Geographic distribution of number of reverted Sabin-2 infections over time based on proposed response with and without NIDs.