Intended for healthcare professionals

Letters Covid-19 laboratory leak hypothesis

Covid-19 laboratory leak hypothesis: extraordinary claims demand extraordinary evidence

BMJ 2021; 374 doi: (Published 13 August 2021) Cite this as: BMJ 2021;374:n2006
  1. Owain Donnelly, clinical lecturer in tropical medicine
  1. RCSI University of Medicine and Health Sciences, Dublin, Republic of Ireland
  1. owain.donnelly{at}

Thacker’s piece on the laboratory leak hypothesis does not provide much clarity for readers on the various arguments in the literature for the virus having a natural origin.1

A quotation notes that “An accident . . . is the opposite of a conspiracy,” but the conspiracy refers to the major effort needed to cover up such an incident, which would most likely involve hundreds of people. Such an extraordinary …

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