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May 14, 2021 "Greater clarity on the origins of the Covid-19 pandemic is necessary and possible. We must take the hypotheses on both natural and laboratory spillovers seriously, until we have sufficient data", they write in a letter published on 'Science', 18 scientists, who ask to consider both hypotheses on the origin of Sars-Cov-2: the jump of species into nature, but also the possibility that the virus is the result of an accident in the laboratory.

The researchers urge "adequate investigation", which "should be transparent, objective, data-driven and extensive experience, independently reviewed and responsibly managed to minimize the impact of conflicts of interest."

"Likewise, public health agencies and research laboratories - ask the scientists - must open their archives. The veracity and origin of the data on which the analyzes are conducted and the conclusions drawn must be documented, so that analyzes are reproducible by independent experts ".