1. Fresh Air NHS. Improve ventilation of care settings & upgrade respiratory personal protective equipment—open letter. Jan 2021. https://docs.google.com/forms/d/e/1FAIpQLSejgqHBTsCjfOG3BdZRHsBzx4cMxZEEnarozhztDo4tdc4zdQ/viewform?gxids=7628.
2. AGP Alliance. Position statement on AGPs/PPE September 2020. Updated Oct 2020. https://www.bapen.org.uk/pdfs/covid-19/agp-alliance-position-paper.pdf.
3. Covid-19: Airborne transmission is being underestimated, warn experts
4. Covid-19: CDC publishes then withdraws information on aerosol transmission
5. Centers for Disease Control and Prevention. Scientific brief: SARS-CoV-2 and potential airborne transmission. Updated 5 Oct 2020. https://www.cdc.gov/coronavirus/2019-ncov/more/scientific-brief-sars-cov-2.html.