Figure 3.

 Inactivation of Flu‐A (a) and FCV (b) in the wet state by low‐concentration ClO₂ gas. Drying was not performed for viruses in the wet state (see Materials and methods). This represents samples with no organic load. The asterisks indicate titre reductions of >2 log₁₀ (*) and >5 log₁₀ (**) as compared with control values (in ordinary air). The double asterisks represent below the detection limit (<0·5 log₁₀[TCID₅₀ per 50 μl]) of the assay. Data represent mean ± SD (n = 4). (•) air (control); (○) ClO₂ gas (mean 0·05 ppmv).