A freezer cabinet on the ground floor of a Phnom Penh laboratory and an irrigation pipe in a wildlife sanctuary in Thailand are not the most obvious places to look for the origins of the virus that sparked the Covid-19 pandemic.But both have offered clues. Stored away in a freezer at the Pasteur Institute in Cambodia was a decade-old bat pathogen that counts as one of the closest known relatives to the Sars-CoV-2 virus now linked to the deaths of 2.5 million people worldwide.“We know these…


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