https://www.sciencedaily.com/releases/2021/09/210908062553.htm > The researchers analyzed inequities in vaccination in the 9 largest U.S. cities covering a total population of 40.8 million people: New York, Los Angeles, Chicago, Houston, Phoenix, Philadelphia, San Antonio, San Diego, and Dallas. > Using data on COVID-19 vaccination and death rates from state and local health authorities, the researchers sorted neighborhoods into four groups in order of vaccination rate, which they defined as the fraction of adults with at least one dose. Neighborhoods in the lowest vaccination group had less than half the vaccination rate of those in the highest group (28 percent vs. 60 percent).