Figure 4.

Environmental Persistence of SARS-CoV-2

The viability of SARS-CoV-2 under various temperature conditions (4°C, 20°C, 28°C, and 37°C) and relative humidity (RH) (low [L]: 40%–60%; high [H] > 99%) with time (0, 1, 4, 8, 24, and 48 h) on the surface of gauze cloth (A) and their half time of decay (B). The initial titer of the working virus solution was approximately 4.56 Log₁₀(PFU)/mL. (A) The experiments were conducted in replicates and the mean values and standard error of virus titer are shown. (B) The half-time was calculated according to the first 4-h virus viability and the 95% confidence interval was added as the error bar. The differences between the two groups were compared by Tukey's honestly significant difference pairwise comparison test.