At room temperature (22°C) with a relative humidity of around 65%, the rank of stability of a 5 μL droplet of virus culture (from most stable to least):

• outer layer of a surgical mask (virus still detectable on day 7)
• stainless steel and plastic (virus not detectable on day 7)
• glass and banknote (not detectable on day 4)
• Treated wood and cloth (not detectable on day 2)
• printing and tissue papers (not detectable after 3 hours)

**a biphasic decay of infectious SARS-CoV-2 was found in samples recovered from these smooth surfaces