The only places that needed to be shut down is nursing homes. But how do you shut one down? Send the people there out onto the street?
The residents didn't have it. It was brought by someone working there or visiting. Or, on a day out shopping at Walmart or wherever.
I have heard that most of the laundry in nursing homes is done by, you guessed it: Chinese immigrants. Imagine that. The Chinese. I wonder if they brought the virus in. Perhaps.