PPE must guard against airborne transmission of COVID-19, nurses' union demands The Ontario Nurses' Association (ONA) is demanding better personal protective equipment (PPE) to protect its members from the aerosol and asymptomatic spread of COVID-19. Social Sharing CBC News · Posted: Apr 20, 2021 4:00 AM ET | Last Updated: April 20 Nurses with the William Osler Health System perform COVID-19 testing at a drive-in centre near Etobicoke General Hospital in Toronto on April 14, 2020.(Evan Mitsui/CBC) The Ontario Nurses' Association (ONA) is demanding better personal protective equipment (PPE) to protect its members from the aerosol and asymptomatic spread of COVID-19. In an application for judicial review filed in February, the ONA said the province hasn't done enough to protect health-care workers from COVID-19, singling out a directive from Ontario's chief medical officer of health as inadequate.