But PHAC told CBC News it is not updating its guidance on airborne transmission — even though it admits aerosol spread has happened. "Aerosol transmission of COVID-19 in ventilated and unventilated environments continues to be studied," a statement from the federal agency stated. "There have been situations where aerosol transmission in closed settings has occurred." "If you promote avoiding a poorly ventilated indoor area, you implicitly admit that you accept aerosol transmission because the ventilation effects only aerosol transmission," he said. "We have a lot of data that builds up a very strong case for aerosol transmission to be also a part of the transmissibility of the disease."

Source: CBC News October 10, 2020 08:00 UTC