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. 2021 Nov 1;8:743988. doi: 10.3389/fmed.2021.743988

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Copyright © 2021 Yin, Dellicour, Daubie, Franco, Wautier, Faes, Van Cauteren, Nymark, Hens, Gilbert, Hallin and Vandenberg.

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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Phase diagram generated for different time periods: situation from March 1 to July 14, 2020 (A), situation from July 14 to September 1, 2020 (B), and situation from September 1, 2020, to February 1, 2021 (C), situation from February 1 until May 15, 2021 (D). See the text for further detail on the principle of phase diagrams. Dots of the phase diagram are coloured according to 14-day median Ct values (thus computed using a backward sliding window of 14 days, from May 1, 2020). Triangle symbols indicate the dates when Ct values crossed down the threshold value of 22.3.