Figure 1.

Coronavirus survival as function of the dose of far-UVC light. Fractional survival, PFU_UV / PFU_controls, is plotted as a function of the 222-nm far-UVC dose. The results are reported as the estimate plaque forming units (PFU)/ml using the conversion PFU/ml = 0.7 TCID₅₀ ²⁹ by applying the Poisson distribution. Values are reported as mean ± SEM from multiple experiments (n = 3 alpha HCoV-229E and n = 4 for beta HCoV-OC43); the lines represent the best-fit regressions to equation (1) (see text and Table 1).