National Institutes of Health (NIH) USA following a study of blood samples, it was reported that the first cases of coronavirus infection in the country occurred at the end of 2019.
“The results of this report suggest that SARS-CoV-2 infection may be present in the United States in December 2019. “earlier than expected,” the report said.
It should be noted that more than 24,000 blood samples submitted by Americans from 50 states were analyzed from January 2 to March 18, 2020. According to the results of the study, the researchers concluded that a number of US citizens developed antibodies as early as January 2020 – until the first recorded information about COVID-19 in their places of residence was confirmed