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Tim Harford explains the numbers and statistics in the news and in life

Tim Harford explains the numbers and statistics in the news and in life.

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The origins of Covid

19/06/2021 GMT

BBC World Service - More or Less, The origins of Covid

To find out where a virus comes from, researchers compare it to other viruses to try to trace its origin. This leads to claims like SARS-CoV-2 is 91 or even 96% similar to other known viruses. But what does that really mean?

Tim Harford talks to the virus ecologist Marilyn J Roossinck.


(Photo: A Microbiology lab carries out sequencing of coronavirus samples. Credit: Javier Pulpo/Getty Images)

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