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. 2021 Nov 1;12:693938. doi: 10.3389/fimmu.2021.693938

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Copyright © 2021 Kumar, Narayan, Prasoon, Kumari, Kaur, Kumar, Kulandhasamy, Sesham, Pareek, Faiq, Pandey, Singh, Kant, Shekhawat, Raza and Kumar

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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The symptomatology of coronavirus disease 2019 (COVID-19). (The onset of the clinical symptoms occurs in average 5–6 days after exposure, and normally, those with mild symptoms recover within 2 weeks; however, in severe cases, the recovery may extend up to 6 weeks. Persistence of the disease or, after complete recovery, emergence of new ailments, together known as “long COVID” may occur in some patients. The “long COVID” is chiefly characterized by the presence of fatigue, headache, dyspnea, and anosmia, which may persist for 4–12 weeks.