Table 3.
Half-life of viruses on each surface.
| Half-life, hour, median (95% CI) |
||||||
|---|---|---|---|---|---|---|
| IAV |
SARS-CoV-2 |
|||||
| 4 (Log10FFU) | 3 (Log10FFU) | 2 (Log10FFU) | 4 (Log10TCID50) | 3 (Log10TCID50) | 2 (Log10TCID50) | |
| Plain paper (PP) | 0.62 (0.51–0.77) |
0.82 (0.68–1.02) |
1.24 (1.02–1.53) |
2.03 (1.82–2.27) |
2.71 (2.42–3.02) |
4.06 (3.64–4.53) |
| Inkjet paper (IP) | 0.11 (0.07–0.19) |
0.15 (0.09–0.25) |
0.22 (0.14–0.38) |
0.22 (0.15–0.33) |
0.29 (0.20–0.44) |
0.44 (0.30–0.67) |
| Inkjet photo paper (IPP) | 0.20 (0.14–0.28) |
0.26 (0.19–0.37) |
0.39 (0.29–0.56) |
0.34 (0.24–0.51) |
0.45 (0.32–0.68) |
0.68 (0.48–1.02) |
The elapsed time was defined as an explanatory variable (X-axis), and the log virus titer of IAV or SARS-CoV-2 was defined as an explained variable (Y-axis). A linear regression analysis with logarithmic link function was performed for each virus to create a curve of regression. The half-life of the virus changed depending on the elapsed time or the amount of virus remaining on each surface. Therefore, the half-life of each virus was calculated from the slope of each regression curve when the amount of virus remaining on the surface was 2, 3, and 4 Log10FFU or Log10TCID50 respectively.