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. 2023 Mar 16;18(3):e0282708. doi: 10.1371/journal.pone.0282708

Fig 4. Controlling for media type and volume differences.

Fig 4

SARS-CoV-2 longevity in saliva versus nasal specimens in eNAT media, by (A) Ct values, (B) percent of Ct values under 30 and (C) number of positive and negative test results for saliva and nasal swabs over days since symptom onset (n = 80 observations from 45 patients). SARS-CoV-2 longevity in saliva swabbed in VTM media versus nasal swabs in VTM media, by (D) Ct values, (E) percent of Ct values under 30 and (F) number of positive and negative test results for saliva and nasal specimens over time intervals in days since symptom onset (n = 134 observations from 86 patients). Comparisons of medians within each timespan were performed using the Wilcoxon signed-rank test and comparisons of proportions between specimen types within each timespan were performed using the McNemar test for correlated proportions.