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. 2022 Apr 21;42(10):1319–1327. doi: 10.1038/s41372-022-01391-9

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© The Author(s), under exclusive licence to Springer Nature America, Inc. 2022

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 — Study design of patient cohorts for serum cytokine analysis. Control: mothers with no report of COVID-19 disease at any time during their pregnancy and negative for SARS-CoV-2 at time of delivery screening. Early COVID: mothers with SARS-CoV-2 positive testing within the 1st or 2nd trimester of pregnancy (1–27 weeks gestation). Late COVID: mothers with SARS-CoV-2 positive testing in the 3rd trimester of pregnancy (28–41 weeks gestation).