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The Swiss Cheese Respiratory Virus Defence

posted on 2022-10-17, 21:35 authored by Ian M. MackayIan M. Mackay

An infographic I made to help clarify that in order to best limit personal risk and community risk from being infected by, or passing on, SARS-CoV-2 and any other respiratory viruses like influenza, RSV and rhinoviruses. We need to think of using a range of risk reduction measures. Each has its own failings and these can be affected by circumstances so layering them up helps avoid any single measure's (layer) problems (holes).

Or you could just physically distance by living on an island, by yourself, forever! (I reckon we'll run out of islands).

So instead, think about this layered approach originally outlined in 1990 by Prof James Reason.

Based on Prof James Reason's analyses (e.g. Layout inspired by a graphic from @sketchplanator (


1.use the .svg for editing but the font (Reprise Script) is not embedded; use the .png if you want the exact same look

2. Thanks to many people for a range translations


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