Scientists from the National Institute of Allergy and Infectious Diseases (NIAID), used a device to dispense an aerosol that duplicated the microscopic droplets created in a cough or a sneeze. The research was aimed 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.
Source: NIH / CDC https://bit.ly/2U66eQQ