Figure 2.

Positive detection rate of SARS-CoV-2 in saliva samples by four SARS-CoV-2 rapid antigen tests: Flowflex (Flowflex SARS-CoV-2 rapid antigen test, ZetaGene-Hughes healthcare, Sweden/UK; blue bars), Panbio (Panbio COVID-19 ag rapid test, Abbott, UK; Orange bars), Joinstar (Joinstar COVID-19 antigen rapid test, China; grey bars), PCL (PCL COVID-19 ag antigen gold saliva lateral flow test, Korea; yellow bars). Saliva specimens were collected from patients with confirmed COVID-19 (n = 44), and 34 samples were above the threshold of detection by RT-PCR (Ct<40). Patients were grouped according to (a) PCR Ct values: Ct<25; 25≤ Ct<29; 29≤ Ct<40; (b) days after COVID-19 symptoms onset: Days≤5; 5< Days≤10; Days≥10; (c) Ct<25, Days<10