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Lancet Respiratory Medicine, 29 Oct 2020
[1] Surface transmission is unlikely to be a major route of transmission, as although SARS-CoV-2 can persist for days on inanimate surfaces, attempts to culture the virus from these surfaces were unsuccessful.
[2] For social distancing to be effective, infective respiratory particles would need to fall to the ground or be in low enough concentrations at 2 m from the source to not cause transmission.
(WHO says 1 meter / CDC and NHS say 2 meters)
[3] Earlier threshold was 5 μm to differentiate between large and small particles, but 100 μm theshold could better differentiate the particles.
[4] Particles that would fall to the ground within 2 m are likely to be 60–100 μm in size.
[5] Pathogens are most commonly found in small particle aerosols (<5 μm), which are airborne and breathable.
[6] Transmission from people > 2 m apart has occurred but in enclosed spaces with poor ventilation, and typically with extended exposure to an infected person of more than 30 min.
[7] CDC says most infections are spread through close contact and that airborne transmission is not the primary route of transmission.
Link: Lancet Respiratory Medicine, 29 Oct 2020
https://www.thelancet.com/journals/lanres/article/PIIS2213-2600(20)30514-2/fulltext
