After coughing, a State Department official met with European diplomats. Then he tested positive.

As part of a diplomatic tour through Europe in late October, the State Department’s director of policy planning briefed journalists in London about the Trump administration’s strategy toward China. A video of the virtual event showed him coughing at least six times during the hourlong discussion.

source https://www.nytimes.com/2020/11/01/world/after-coughing-a-state-department-official-met-with-european-diplomats-then-he-tested-positive.html