Study: 5 States Had Virus Infections Before First Reported Cases

A government study indicates that the coronavirus was present in at least five US states weeks before they reported their first cases, suggesting the virus was in the US as early as December 2019. The study analyzed over 24,000 antibody samples from Illinois, Massachusetts, Mississippi, Pennsylvania, and Wisconsin, as part of an NIH research program.

When was the virus first detected in the US according to the study?

What was the duration of the study mentioned in the text?