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. 2021 Sep 20;36(2):588–590. doi: 10.1038/s41375-021-01418-8

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© The Author(s), under exclusive licence to Springer Nature Limited 2021

This article is made available via the PMC Open Access Subset for unrestricted research re-use and secondary analysis in any form or by any means with acknowledgement of the original source. These permissions are granted for the duration of the World Health Organization (WHO) declaration of COVID-19 as a global pandemic.

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Fig. 1 — TP0 is day of 1st dose, TP1 is day of 2nd dose (3rd week after 1st dose), TP2 is 5th week after 1st dose, TP3 is 12th week after 1st dose. To evaluate the effect of the second dose of vaccine and of IgG decay kinetics in the groups, the Wilcoxon test was used for comparing geometric mean concentration (GMC) between TP1, TP2, and TP3.