Less than 1% of Americans live in nursing homes, yet these facilities account for between 15% and 25% of Covid-19 cases and half of all deaths from the disease in some states; in Minnesota, nursing home residents and workers account for 81% of all Covid-19 deaths. Workers in these facilities are at great risk of occupational exposure to the coronavirus, but they also pose a risk of transmitting it more widely — bringing it into nursing homes from the community and spreading it to the community from nursing homes. It will take federal money to do this — testing all residents and nursing home staff nationally just once would cost $440 million, and repetitive testing will be needed for some time to control the spread of SARS-CoV-2 in nursing homes.