Conversely, patients with a COVID-19 diagnosis exhibited higher median C-reactive protein concentration (CRP—56.6 vs 6.0 mg/dL) and lower median peripheral blood oxygen saturation (SpO2—94.0 vs 97.0%), as well as a higher proportion of fever (70.5% vs 9.6%) and dyspnoea (44.8% vs 10.7%) as presentation signs and symptoms, when compared with those without COVID-19. Here, CRP is linked to COVID-19.