Relative bradycardia is a useful clinical feature for distinguishing COVID-19 from influenza

We retrospectively examined febrile (>38.3°C) adult patients with microbiologically confirmed coronavirus disease (COVID-19) (n=48) or influenza (n=63). The median pulse rate (/min)/body temperature (°C) ratio was significantly lower for COVID-19 patients (2.14; interquartile range, [IQR] 1.92–2.47) than for influenza patients (2.63; IQR, 2.31–2.93; P