Almost two years since the start of the pandemic, we still don’t know how or when the deadly Sars-Cov-2 virus emerged. Investigating new viruses is always extremely complex, but scientists have been able to find the source of the two previous coronavirus outbreaks – both of which have emerged from animals. It’s been nine months since the last WHO-convened mission returned from Wuhan, saying a similar animal spillover was the most likely source of the pandemic. But questions continue to be raised about a potential accident at a Wuhan lab which studies coronaviruses and keeps thousands of bat samples. China has strenuously denied this. Why has it taken long ?
