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. 2022 Nov 14;10:989456. doi: 10.3389/fped.2022.989456

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© 2022 Sandoni, Schaffrath Rosario, Michel, Kuttig, Wurm, Damerow, Iwanowski, Finkel, Schrick, Buchholz, Haas, Varnaccia, Kubisch, Jordan, Schienkiewitz, Nitsche and Loss.

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Timeline sampling scheme for bio samples taken from the participants of the COALA study (SARS-CoV-2 index cases, secondary cases and close contacts of SARS-CoV2 cases in the respective daycare center group and households). Participants were enrolled 4–6 days after the index case got tested. GP = general practitioner.