That's really weird, since they have been able to trace so many cases. Of course someone that contaminated a nursing home were 24 people died would be in hiding about now.
I mean, the person may not even know. Virus can live on surfaces for a few days. Coworker comes back from a trip through the PDX airport, sneezes in their hand and goes into the restroom or touches the door. Next coworker comes through and grabs that handle, goes to visit grandma that evening.