This tool is based on knowledge distilled from 26 international experts with different areas of expertise, brought together into a single graphical form which is designed to help illustrate the risks of catching Covid-19 in different scenarios - and what can be done to reduce those risks. We hope that it will help everyone make informed decisions about the relative risks in different situations, and what they might do to help protect themselves and others.

A piece describing the development of the tool is published in the BMJ here, and there is more about the findings here.