You may have seen a version of the infographic (below) that explains the potential impact of social distancing. It nicely illustrates that reducing the total number of disease-spreading contacts each infected person has can have a dramatic effect on the total number of infections a short time later. The numbers rely on the mathematical concept of “exponential growth”. Recently, Boris Johnson, the British prime minister, told the press that “it looks as though we’re now approaching the fast growth part of the upward curve. And without drastic action, cases could double every five or six days”. The consistent doubling of…
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