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. 2021 Apr;27(4):1146–1150. doi: 10.3201/eid2704.204199

Figure 2.

Figure 2

Detection of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) in saliva samples tested for infectious SARS-CoV-2. SARS-CoV-2 N1 detection (Ct values) measured by quantitative reverse transcription PCR for each saliva sample incubated with Vero-E6 cells for 72 hours. The orange diamond depicts the only sample that produced plaque-forming units (titer increase of 3.79 × 104 PFU/mL; purple circles indicate samples that did not produce plaque-forming units by 72 h after inoculation; dashed lines indicate Ct 38 (the cutoff for sample positivity); gray shading indicates Cts below the limit of detection. Ct, cycle threshold.