Table 4A.

Percent change in SARs-CoV-2 N gene viral signal at 4 °C, −20 °C, and −80 °C.^⁎

Time (days)	% change at 4 °C	% change at −20 °C	% change at −80 °C
7	1.11	32.29	36.61
14	11.23	65.12	35.44

^⁎The percent change (% change) was calculated for all sites on day 7 and day 14 as % change = 100 × (control − treatment) / control, where control (day 0 samples directly extracted) and treatment (samples stored at 4 °C, −20 °C and − 80 °C) are the associated measurements. A positive % change indicated that the treatment result was smaller than the control, whereas a negative % change indicated the treatment had higher concentrations than the control.