TABLE 1.

Sensitivity of the Panbio NA Ag-RDT (versus NP Ag-RDT) stratified by C_T value^a

CT range	Sensitivityb (%; no. of sensitive samples/total no. of samples)	95% CI (%)
<15	100 (15/15)	78.2–100
15–19.9	94.0 (79/84)	86.7–98.0
20 to 24.9	80.5 (33/41)	65.1–91.2
25 to 29.9	57.1 (4/7)	18.4–90.1
≥30	0.0 (0/2)	0–84.2

^aAg-RDT, antigen-based rapid diagnostic test; C_T, cycle threshold; CI, confidence intervals; NA, nasal; NP, nasopharyngeal; RT-PCR, reverse transcription PCR.

^bSensitivity of the Panbio NA Ag-RDT was determined from NP swabs tested by Ag-RDT, which were confirmed using real-time RT-PCR.