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. 2021 Jan 12:dyaa277. doi: 10.1093/ije/dyaa277

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© The Author(s) 2021; all rights reserved. Published by Oxford University Press on behalf of the International Epidemiological Association

This article is made available via the PMC Open Access Subset for unrestricted re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for the duration of the COVID-19 pandemic or until permissions are revoked in writing. Upon expiration of these permissions, PMC is granted a perpetual license to make this article available via PMC and Europe PMC, consistent with existing copyright protections.

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Seroprevalence of IgG against SARS-CoV-2 in Madrid, Barcelona (Catalonia) and Coruña (Galicia) in HM Hospital workers compared with the estimated seroprevalence in the same regions in a national study estimating seroprevalence in the general population;⁸ Error bars represent 95% confidence intervals