In 2018, Diplomats Warned of Risky Coronavirus Experiments in a Wuhan Lab. No One Listened.

These researchers, the American officials learned, had found a population of bats from caves in Yunnan province that gave them insight into how SARS coronaviruses originated and spread. The researchers boasted that they may have found the cave where the original SARS coronavirus originated. But all the U.S. diplomats cared about was that these scientists had discovered three new viruses that had a unique characteristic: they contained a "spike protein” that was particularly good at grabbing on to a specific receptor in human lung cells known as an ACE2 receptor. That means the viruses were potentially very dangerous for humans—and that these viruses were now in a lab with which they, the U.S. diplomats, were largely unfamiliar.

By April, U.S. officials at the NSC and the State Department had begun to compile circumstantial evidence that the WIV lab, rather than the seafood market, was actually the source of the virus. The former explanation for the outbreak was entirely plausible, they felt, whereas the latter would be an extreme coincidence. But the officials couldn’t say that out loud because there wasn’t firm proof either way. And if the U.S. government accused China of lying about the outbreak without firm evidence, Beijing would surely escalate tensions even more, which meant that Americans might not get the medical supplies that were desperately needed to combat the rapid spread of SARS-CoV-2 in the United States.