Fig. 1From: Tracheostomy for COVID-19: evolving best practiceTypical clinical course, viral polymerase chain reaction (PCR), and antiviral antibody detection and infectivity of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection. The transparent red box shows the suggested window for tracheostomy, on ICU days 10–21, which corresponds with 16–30 days from symptom onset. The solid bars and curves represent the proportion of all cases. Time zero is symptom onset (the x-axis is not to scale). Adapted from [19] with permissionBack to article page