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Table 2 Clinical features of SARS, MERS, and COVID-19

From: A review of the genome, epidemiology, clinical features, prevention, and treatment scenario of COVID-19: Bangladesh aspects

SARS MERS COVID-19
1. Predominant features were constant fever, chill or rigors, dry cough, myalgia, headache, and malaise [50]. 1.Onset of disease with fever, chills or rigors, cough, sore throat, myalgia, and arthralgia, followed by dyspnea [51, 52]. 1. Predominant symptoms are fever, cough, and sore throat. Other common features are fatigue, myalgia, and dyspnea [53, 54].
2. Less common features were sore throat, running nose, sputum production, dyspnea, anorexia, nausea and vomiting, headache, and dizziness [50, 55]. 2. Enteric manifestations such as diarrhea, vomiting, anorexia, and stomach pain [56, 57]. 2. Unusual features such as headache, nausea or vomiting hemoptysis, and diarrhea [1, 25].
3. Severe cases: recurrence of fever, shortness of breath, hypoxemia, and ARDS [58]. 3.Severe patients: ARDS, multiple organ failure including renal failure and respiratory failure [59, 60]. 3. Severe patients: acute pneumonia, hypoxemia, and ARDS [28].
4. Almost 61% manifested mild symptoms, 11.1% had acute respiratory complications [27]. 4. 21% of patients exhibited mild or no symptoms, whereas 46% possess severe complications or died [61]. 4. 80.9% of patients had mild pneumonia, 13.8% had acute complications, and 4.7% considered critical and needed ICU care [62].