Two years in, there is no doubt the Covid pandemic began in the Chinese city of Wuhan. But there is also little doubt that the bat carrying the progenitor of the virus lived somewhere else.
Central to the mystery of Covid’s origin is how a virus normally found in horseshoe bats in caves in the far south of China or south-east Asia turned up in a city a thousand miles north. New evidence suggests that part of the answer might lie in Laos.
New documents show that just 18 months before the first Covid-19 cases appeared, researchers had submitted plans to release skin-penetrating nanoparticles containing “novel chimeric spike proteins” of bat coronaviruses into cave bats in Yunnan, China.
They also planned to create chimeric viruses, genetically enhanced to infect humans more easily, and requested $14million from the Defense Advanced Research Projects Agency (Darpa) to fund the work.