Fig. 9. Average PFU mL⁻¹ of SARS-CoV-2 virus recovered after contact with SNAP coated substrates for times ranging from 10 min to 4 h. Black = 2 w/v%; blue = 4 w/v%/OC; red = 4 w/v%. (A–C) Results obtained with Delta variant. Graph D shows average PFU mL⁻¹ of Omicron variant recovered after contact with 4 wt% substrate. Values represent mean ± SD (n = 3; ***P ≤ 0.001; ** P ≤ 0.01; *P ≤ 0.05).