Hot swab–to–RT-LAMP    RT-LAMP
CT   Pos   Neg   Sum
RT-qPCR   Pos   0–25  38  4  42
25–30  17  5  22
30–35  5  23  28
35–40  0  36  36
Neg   Neg  1  214  215
Sum  61  282  343
Direct swab–to–RT-LAMP    RT-LAMP
CT   Pos   Neg   Sum
RT-qPCR   Pos   0–25  15  1  16
25–30  6  11  17
30–35  2  21  23
35–40  3  23  26
Neg   Neg  9  144  153
Sum  35  200  235