Fig. 4: Filtration efficiency of aerosolised Inactivated SARS-CoV-2.

a Inactivated SARS-CoV-2 after-mask concentrations, and, b corresponding filtration efficiencies of silica, blank control and the cotton face covering materials. All data are derived from three independent experiments (mean ± SD, n = 3). Comparisons were performed with one-way ANOVA (two-sided) with Tukey HSD post-hoc test. Each p-value was adjusted to account for Tukey’s multiple comparisons.