Infected person. live now to professor peter openshaw from imperial college london. thank you so much forjoining us on bbc news. covid, it is an issue that still keeps coming around three years later. one of the questions people don't seem to have got to the bottom of yet is how did it start? does this report tell us any more? the two main theories are that it grows spontaneously as an animal to human transmission, probably in this market, where there were wild animals being sold for food. market, where there were wild animals being sold forfood. the other is of course that it was perhaps from...