As the coronavirus soars across the country, charting a single-day record of 99,155 new cases on Friday and surpassing nine million cases nationwide, tracing the path of the pandemic in the United States is no longer simply challenging. It has become nearly impossible.

How Are Americans Catching the Virus? Increasingly, ‘They Have No Idea’ http://a.msn.com/01/en-us/BB1azq1G?ocid=st