An appeal for an objective, open and transparent scientific debate about the origin of SARS-CoV-2

On July 5, 2021, a Correspondence was published in The Lancet called Science, not speculation, is essential to determine how SARS-CoV-2 reached humans.1 The letter recapitulates the arguments of an earlier letter (published in February, 2020) by the same authors,2 which claimed overwhelming support for the hypothesis that the novel coronavirus causing the COVID-19 pandemic originated in wildlife. The authors associated any alternative view with conspiracy theories by stating: We stand together to strongly condemn conspiracy theories suggesting that COVID-19 does not have a natural origin. The statement has imparted a silencing effect on the wider scientific debate, including among science journalists.3 The 2021 letter did not repeat the proposition that scientists open to alternative hypotheses were conspiracy theorists, but did state: We believe the strongest clue from new, credible, and peer-reviewed evidence in the scientific literature is that the virus evolved in nature, while suggestions of a laboratory leak source of the pandemic remain without scientifically validated evidence that directly supports it in peer-reviewed scientific journals. In fact, this argument could literally be reversed. As will be shown below, there is no direct support for the natural origin of SARS-CoV-2, and a laboratory-related accident is plausible.