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. 2022 Nov 10;11(11):e34075. doi: 10.2196/34075

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©Katherine E Halliday, Patrick Nguipdop-Djomo, William E Oswald, Joanna Sturgess, Elizabeth Allen, Neisha Sundaram, Georgina Ireland, John Poh, Samreen Ijaz, Justin Shute, Ian Diamond, Emma Rourke, Fiona Dawe, Alison Judd, Taane Clark, W John Edmunds, Chris Bonell, Punam Mangtani, Shamez N Ladhani, Sinéad M Langan, James Hargreaves, COVID-19 Schools Infection Survey Study Group. Originally published in JMIR Research Protocols (https://www.researchprotocols.org), 10.11.2022.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work, first published in JMIR Research Protocols, is properly cited. The complete bibliographic information, a link to the original publication on https://www.researchprotocols.org, as well as this copyright and license information must be included.

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The Schools Infection Survey recruitment and participation profile for secondary schools during rounds 1 to 3. Suppressed numbers are indicated by C. Percentage of eligible refers to eligible participants within schools enrolled and participating in that round. In rounds 1 to 3, eligible secondary students refers to the 2 selected eligible classes. From January 2021, secondary schools were invited to open enrollment up to the whole school (excluding year 11), leading to an increase in eligible students in rounds 4 to 6. LA: local authority.