From Bess Levin in her Vanity Fair newsletter, remembering Feb 2020...
The ban, which took effect in early February, allowed travel to the United States from Hong Kong and and Macao territories, and more than 8,000 Chinese and foreign nationals based in those areas entered the country in the first three months after the restrictions went into place, according to the Associated Press.
Meanwhile, more than 27,000 Americans returned to the U.S. from mainland China in the first month after the ban went into effect and, as the Associated Press notes: “U.S. officials lost track of more than 1,600 of them who were supposed to be monitored for virus exposure.”