CRP and COVID-19: Compared with patients that did not reattend ED, patients that reattended ED (admitted or not) had a slightly higher median age (54 vs 47 years), higher mean CRP (47.8 vs 34.0 mg/L), lower mean lymphocyte count (1.2 vs 1.4 x1000/μL) and earlier median day of COVID-19 illness (8 vs 9 days) S1 Table in S1 File.