Listen to an audio version of the story. On a recent Saturday, a group of masked neighbors living on Buena Vista Street in Midtown Memphis congregate—at distance, of course— on Jeff Warren’s front yard. “We hope to be the Buena Vista model,” says Warren, who is a medical doctor and a member of the City Council. He means a model for what’s called assurance or surveillance testing. Since mid-November, Warren has been setting up a weekly, mini COVID-19 testing operation in front of his house. Here, the tight-knit residents of the neighborhood—along with their co-mingling children—test for the virus as a group. It’s a strategy to catch asymptomatic carriers of the virus and hopefully reduce spread.