"CDC scientists report that Covid-19 may be marketed in the U.S. in mid-December 2019. The new coronavirus infected people in the U.S. in mid-December 2019. This was a few weeks before the official discovery of the coronavirus in China. The department found the first case in the United States about a month earlier.
These findings greatly enhanced the evidence that the virus had spread worldwide before public health authorities and researchers realized it, subverting people's initial thinking about the time and speed of the virus's emergence. "