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. 2021 Jul 28;110:309–313. doi: 10.1016/j.ijid.2021.07.063

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© 2021 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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Correlation (according to Spearman) between antibody levels (Roche Elecsys S total antibody electrochemiluminescence assay) and age for AZD1222 (left column) and BNT162b2 (right column) at different points in time. Crosses indicate 3 weeks after first dose of AZD1222, filled triangles indicate pre-booster, open circles indicate post-booster. BAU, binding antibody units.