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. 2021 Feb 24;8(1):e000830. doi: 10.1136/bmjresp-2020-000830

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© Author(s) (or their employer(s)) 2021. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, appropriate credit is given, any changes made indicated, and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/.

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Correlation of successful virus isolation with cycle threshold (Ct) value from SARS-CoV-2 real-time RT-PCR (rRT-PCR) in 203 positive upper respiratory specimens. (A) Ct values obtained from rRT-PCR of upper respiratory specimens were compared between virus isolation positives and negatives. (B) Percentage of positive (black bar) and negative (grey bar) viral isolation of upper respiratory specimens according to the range of Ct values, expressed as probabilities.