The origins of Covid
More or Less: Behind the Stats - A podcast by BBC Radio 4 - Saturdays
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.
