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. 2020 Jun 18;7:334. doi: 10.3389/fmed.2020.00334

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Copyright © 2020 Wang, Liu, Hu, Zhou, Yu, Li, Xu, Xiao, Yang, Lu, Wang, Yin and Xu.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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PCR cycle threshold (Ct) value detected in NPS and OPS specimens. (A) Comparison of Ct values of 120 paired NPS and OPS specimens. Each data point represents the Ct values of NPS and OPS from one patient. (B) Ct values for NPS and OPS during treatment. Solid curves represent the trend derived by locally weighted scatterplot smoothing method. (C) Comparison of Ct values (with 95% CI) of paired NPS and OPS from 120 patients. (D) Comparison of Ct values (with 95% CI) of paired NPS and OPS from 57 patients with positive SARS-CoV-2. A lower Ct value corresponds to a higher viral load.