Covid-19 transmission

The ideas in public circulation about preventing transmission of coronavirus are now quite adrift from the evidence that has accumulated in the past 6 months. As part of tackling this – and the absence of attention to ventilation in particular – we have created this snapshot.

Please share this widely amongst your networks.

Graphic from Sense About Science (motto: Ask For Evidence) shows four statements: (1) Transmission rate indoors is 18 times the rate outdoors. (2) Infection risk in a ventilated room is 0.3 times that in an unventilated room. (3) Food: "There is currently no vidence that food is a source of coronavirus and it is very unlikely it can be transmitted through the consumption of food." (4) Surfaces: "Despite consistent evidence as to SARS-CoV-2 contamination of surfaces and the survival of the virus on certain surfaces, there are no specific reports which have directly demonstrated fomite [contaminated object] transmission." Graphic provides sources for these four statements: (1) Outdoor transmission of SARS-CoV-2 and other respiratory viruses, a Systematic Review 29/11/20; (2) Calculated from SAGE, EMG paper, Role of Ventilation in Controlling SARS-CoV-2 Transmission 30/9/20; (3) Food Standards Scotland citing European Food Safety Authority 18/1/21; (4) World Health Organisation 9/7/20.

Published 4 February 2021