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. 2021 Oct 26;11(10):e051045. doi: 10.1136/bmjopen-2021-051045

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© Author(s) (or their employer(s)) 2021. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, appropriate credit is given, any changes made indicated, and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/.

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Simple correlation analysis of rate of decay of anti-spike antibodies between both phases with baseline characteristics and symptoms. **Correlation is significant at the 0.01 level; *correlation is significant at the 0.05 level. GI, gastrointestinal symptoms (nausea, vomit, diarrhoea); HCW, healthcare worker.