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He has waited too long and the chances of uncovering the truth about the origins of Covid-19 are slim. In a joint letter, entrusted to the scientific journal Nature, the super-experts enlisted by the World Health Organization (WHO) to reconstruct the birth and spread of Sars-CoV-2 do not use mincing words. The useful time window is closing rapidly and a further delay will make some of the necessary studies biologically impossible: the first patients are cured, the antibodies disappear, the animals are killed, the virus mutates and new variants emerge.
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