The average difference in cycle threshold values between the last and first samples was 2.9 (median 3.4, interquartile range −0.5 to 6.4); 73.8% had a positive difference, indicating an increasing trend in cycle threshold values among participants over time (Appendix 1, Supplementary Appendix D, Figure 2).
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Salivary testing for SARS-CoV-2 in the pediatric population: a diagnostic accuracy study.
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