In one study, the symptoms of 81 "middle aged" adults, who were between 50 and 64 years old, were recorded as follows: Fever: 63 patients (77.8%) Cough: 37 patients (45.7%) Dyspnea: 5 (6.2%) Fatigue: 26 patients (32.1%) Headache: 7 patients (8.6%) Respiratory rate: 19.9 $\pm$ 3.5 Oxygen saturation: 93.3 $\pm$ 2.7

Maximum body temperature was:

• Below 37 degrees Celsius: 18 patients (22.2%)
• 37 or 38 degrees Celsius: 34 patients (42.0%)
• Above 38 degrees Celsius: 29 patients (35.8%)