The COVID-19 coronavirus entered the United States back in December 2019.
According to Axios, this is the conclusion reached by researchers from the U.S. National Institutes of Health (NIH).
According to the scientists, the coronavirus was already detected in blood samples from patients on at least January 7, 2020. Thus, the pathogen entered the United States as early as late 2019.
COVID-19 was detected in the blood of nine patients from Illinois, Mississippi, Massachusetts, Pennsylvania and Wisconsin. Specialists have not yet learned whether those infected had human contact or traveled out of the country.