evidence: For much of the past year she has met the suggestion that Sars-Cov-2 might have escaped from the Wuhan Institute of Virology with angry denial. [...] Those scientists who argue that the possibility of an accident at the Wuhan Institute of Virology should also be included as part of any investigation are curious about this apparent silence. [...] Prof Shi Zhengli recently told the BBC in an exchange of emails that she'd welcome "any form of visit" by an inquiry team to the Wuhan Institute of Virology to rule out the possibility of a lab leak.