ly manner, as progression of the respiratory pathology to pneumonia might result in catastrophic outcomes (Jian‐ya, 2020).

5.1  Clinical symptom spectrum
Understanding the otherwise nonspecific clinical signs and symptoms of COVID‐19 is a crucial step toward appropriate management of the disease. Patients mostly complain of fever, non‐productive cough, and body ache or extreme tiredness. In some cases, diarrhea and nausea precede fever by a few days, suggesting that fever might not be the initial manifestation of infection. A small number of patients reportedly had headache, or even developed hemoptysis (Guan et al., 2020; Wang, Hu, et al., 2020). Some patients remained asymptomatic, despite being tested positi