The hypothesis that the Covid-19 virus ‘escaped’ from the Wuhan virology laboratory is “absolutely credible” and “it is important to try to acquire as much data as possible and understand what happened”. This was stated by immunologist and virologist Guido Silvestri, a professor at Emory University in Atlanta, during the broadcast ‘Half an hour more’, arguing his thesis. “There is no – he explains – objective evidence or that the virus came naturally nor do we have evidence that it was a ‘leak’ from the Wuhan laboratory”. However, “if you do a close analysis of the virus sequence, there is a twelve-nucleotide zone of the spike protein that is particularly strange to explain with a simple switch from one virus to another.” In short, he argues, “everyone has found this sequence of proteins which is strange to consider through a natural recombination and we know that in Wuhan artificial viral variants have been developing for years that had an increased ability to infect humans”. This, he adds, “does not mean that this has happened, but it is an explanation that is not totally strange, it must be borne in mind that the onset of the pandemic took place 2.3 km away from the Wuhan Institute of Virology. Without making conspiracy theories it is important to try to acquire as much data as possible and understand what happened “. Among other things, he says, “there are records of experiments in virology laboratories and it can be traced back to the experiments and sequences generated in a given period”.