Scientists from the National Institute of Allergy and Infectious Diseases (NIAID), part of the U.S. National Institutes of Health, attempted to mimic the virus deposited from an infected person onto everyday surfaces in a household or hospital setting, such as through coughing or touching objects.
They used a device to dispense an aerosol that duplicated the microscopic droplets created in a cough or a sneeze.
The scientists then investigated how long SARS-CoV-2 remained infectious on these surfaces, according to the study that appeared online in the New England Journal of Medicine on Tuesday - a day in which U.S. COVID-19 cases surged past 5,200 and deaths approached 100. The tests show that when the virus is carried by the droplets released when someone coughs or sneezes, it remains viable, or able to still infect people, in aerosols for at least three hours.
On plastic and stainless steel, viable virus could be detected after three days. On cardboard, the virus was not viable after 24 hours. On copper, it took 4 hours for the virus to become inactivated...
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