What is the evidence to support the 2-metre social distancing rule to reduce COVID-19 transmission?
Very long survey of scientific reports relative to droplet/aerosol spreads:
The Atheist's post above re meat packing plants is a unique example of ventilation spread which has caused thousands of infections. High volume of air flow. Recirculation with little or no outside air, and low temp ( 10C ) may make these facilities special cases. Be interesting to see what published studies come out.