NBC News
As the U.S. remains in the grip of protests over the death of George Floyd in police custody in Minneapolis, some COVID-19 testing sites have been forced to suspend operations because of violence and unrest in recent days. The temporary closures — from California to Florida — are sure to hamper efforts to control the spread of the coronavirus, particularly as social distancing has given way to mass gatherings of potentially contagious people who don't know they're infected. Meanwhile, as protests sweep nation, research finds social distancing most effective at slowing coronavirus spread.