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. 2022 Jan 28;9:770031. doi: 10.3389/fmed.2022.770031

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Copyright © 2022 Wang, Zhang, Byrd, Yu, Ye and He.

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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COVID-19 cases with three nervous system symptoms in different countries from December 2019 to May 2020. Three symptoms (i.e., headache, loss of smell, and loss of taste) were analyzed. Each symptom has 0–100% of occurrence.