Compared with patients who reattended ED but were not admitted, patient who were admitted had a higher mean CRP (54.2 vs 42.1 mg/L), lower lymphocyte count (0.97 vs 1.41 x1000/μL) and earlier median day of COVID-19 illness (7 vs 8 days) at time of initial COVID-19 assessment. This evidence concerns the gene CRP and COVID-19.