“Before making a controversy you need proof and to date there aren’t any.” This is the lapidary comment by Giuseppe Novelli, full professor of medical genetics at the University of Tor Vergata in Rome, on the hypothesis of the origin of the coronavirus in the laboratory on which Anthony Fauci, director of the National Institute of Allergy and Infectious, also returned. the need for an investigation into the origins of Sars-Cov-2, stating that he is “not convinced” that it developed naturally. Read also “In biology nothing must be invented – adds the geneticist – even if there is no formal proof of the origin of the coronavirus, it is clear that it is natural. It is true, the intermediate animal is missing but to understand how a virus has changed, years of research are needed. Science speaks of facts and not of suppositions “. The geneticist underlines how “around I see too many simplifications on this topic, mutations occur in nature in viruses and bacteria, investigating them is not easy – he remarks – for this reason I reiterate that caution is needed before stating that one is sure of the truth in one way or another “.