Covid infecting humans through animal host 'probable'

A senior member of the World Health Organization's team investigating the origins of Covid-19, has described his trip to Wuhan, China, as the start of a long process.

Speaking to the BBC's Andrew Marr, Professor John Watson said there were a number of hypotheses about the origins of the virus, the most likely being that it moved from one animal to an intermediate animal host, and from there to humans.