Somewhere in China, perhaps in the southern Yunnan province, there’s a cave that may hold the mysterious origins of the deadly coronavirus that’s infected thousands, cut off millions of Chinese from their jobs and families and wreaked havoc in global financial markets.

Peter Daszak, a disease ecologist at nonprofit EcoHealth Alliance, would know. He and his team have suited up and ventured into caves all over China and the rest of world in search of bats and the pathogens they carry. “We go into caves,” said Daszak. “We don’t just walk in. We wear a full-body…