Markers of the pandemic’s impact—testing rates, positivity ratio (cases among total tests), case rates by overall population and deaths—are clustered in neighborhoods, with low-income and predominantly minority communities experiencing worse outcomes than wealthier and predominantly white neighborhoods. The findings, part of the first research to look at comprehensive neighborhood-level data from March through September 2020 from three large U.S. cities—Chicago, New York and Philadelphia—were published today in Annals of Internal Medicine by researchers from Drexel University’s Dornsife School of Public Health.