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. 2021 Dec 22;12:761382. doi: 10.3389/fimmu.2021.761382

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Copyright © 2021 Supriya, Gao, Gu and Baker

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Moderate to low intensity exercise upregulates Th1 and downregulates Th2 in people susceptible to COVID-19 infection (including obese, elderly and people with other comorbidities), COVID-19 patients and COVID-19 survivors with upregulated Th2 and downregulated Th1. Th1 is T helper cells 1 and Th2 is T helper cells 2.