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. 2022 Apr 30;121:55–57. doi: 10.1016/j.ijid.2022.04.053

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© 2022 The Author(s)

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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Study participants for the overall vaccine effectiveness and the vaccine effectiveness by time since vaccination against SARS-CoV-2 infection

Individuals who were tested by reverse transcriptase-PCR(RT-PCR) or rapid antigen (RTK-Ag) or RT-PCR only, between September 1, 2021, to December 31, 2021, and fully vaccinated with homologous BNT162b2 or unvaccinated between September 1, 2021, and November 30, 2021, aged 12 to 17 years and had no confirmed SARS-CoV-2 infections before the outcomes observed.