Fig. 1.

Detection of SARS-CoV-2 antigen using the ESPLINE SARS-CoV-2 kit (Lot no. K4B00811) on days 1, 2, and 4. The photograph taken on day 1 was taken 12 h after the test was read. Photographs taken on days 2 and 4 were taken immediately after the test was read. #1–#5 indicate patient number. Patients #1–#5 were tested on day 1 (A), and patients #3 and #5 were tested on day 2 (B). Patients #1, #3, and #5 were tested on day 4 using all three SARS-CoV-2 antigen rapid test kits currently available in Japan: ESPLINE SARS-CoV-2 kit (Lot no. K4B00815) (C), ImunoAce SARS-CoV-2 (D), and QuickNavi COVID-19 Ag kit (E). Triangles indicate positive bands.