By now, most of us have learned a bit more about droplets, nuclei and aerosols as modes of transmission of the COVID-19 virus. We’ve all heard about the need to clean and disinfect surfaces and objects to help control exposure. We’ve heard about adjustments to a building’s ventilation system to help control the spread of the virus. But with all the information and advice out there, how do you choose the best methods and procedures to use in your situation and what post-cleaning testing is appropriate?