Data collection
All data were retrospectively collected using emergency department clinical records, including demographic data (age and sex), comorbidities (HIV status, diabetes, hypertension, cancer, hemopathy, graft, obesity, chronic lung disease, cardiopathy, immunosuppressive treatment, corticoid treatment, chronic renal insufficiency), clinical signs related to COVID-19 (fever, dyspnea, cough, myalgia, anosmia/ageusia, headaches, rhinorrhea, fatigue, confusion, discomfort, chest pain and abdominal pain), lymphocyte counts, date of symptom onset, pulse oximetry (SpO2) at triage.