March 10, 2020 Skagit Valley Chorale outbreak (Washington, US) super-spreader event at rehearsal where 1 index case spreads COVID-19 to 53 of 61 members in attendance via inhalation of respiratory aerosols generated while singing. Miller, Shelly l., Nazaroff, William W. et al. 2020. “Transmission of SARS‐CoV‐2 by inhalation of respiratory aerosol in the Skagit Valley Chorale superspreading event.” International Journal of Indoor Environment and Health, 2020;00:1–10.
Timeline - A Ontario Society of Professional Engineers call on Ontario to refocus efforts on the airborne transmission of COVID-19
Timeline - A Public Health Agency of Canada releases a full pandemic ventilation guide, highlighting indoor aerosol spread
Timeline - A 363 physicians, scientists, occupational health and safety experts, engineers and nursing professionals send open letter to all levels of Canadian government, urging update of guidelines, regulations and public communication to reflect that COVID-19 spreads through inhaled aerosols.
