A study of five US states that had cases of corona before the first cases were recorded

A new US government study showed that at least seven people were infected with the Corona virus in five US states, weeks before these states announced their first cases.
More than 24,000 blood samples were taken for a research program of the National Institutes of Health between January 2 and March 18, 2020, and were analyzed, and it turned out that seven people had antibodies to the “SARS-Cove-2” virus that causes Covid-19.

The positive samples came from Illinois, Massachusetts, Mississippi, Pennsylvania and Wisconsin, the researchers said.

Source: Reuters