Layers of protection required to defeat COVID-19

  • Post category:News

As the COVID-19 pandemic continues, you may have heard experts refer to the “Swiss cheese model” of pandemic defense.

In this metaphor, cheese slices represent multiple layers of protection that can be employed against COVID-19. Each layer of protection — vaccines, masks, social distancing, quarantine — has its imperfections. When we use multiple layers together, however, our chances of slowing the spread and defeating this virus are stronger.

graphic showing layers of cheese as defense against COVID-19

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Source: Graphic adapted from Ian M. Mackay ( and James T. Reason.