Fig. 1From: Persistence of live virus in critically ill patients infected with SARS-COV-2: a prospective observational studyGraph demonstrating cycle threshold (Ct) vs. days between tests. There was no relationship between the ability to culture live virus and the number of days between tests. No sample grew live virus with a Ct > 25. Samples that were culture negative are in blue, while those that were positive are redBack to article page