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. 2022 Mar 8;12:3788. doi: 10.1038/s41598-022-07849-2

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© The Author(s) 2022

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Box-Whisker plots depicting initial (Upper pannel) anti-SARS-CoV-2 RBD total antibody levels, as measured by the Roche Elecsys electrochemiluminescence sandwich immunoassays (Roche Diagnostics, Pleasanton, CA, USA) and neutralizing antibodies against SARS-CoV-2 Wuhan-Hu-1 variant (Lower pannel), in nursing home residents (Group 1), healthy individuals fully vaccinated with the Comirnaty vaccine (Group 2) and unvaccinated, COVID-19 recovered individuals that required hospitalization in internal medicine or intensive care units (Group 3). P value for comparison across the three groups is shown.