COVID-19 cases in US federal and state prisons were 5.5 times higher—and death rates three times higher—than in the general population from Mar 31 to Jun 6, according to a research letter published yesterday in JAMA.Researchers from Johns Hopkins University and the University of California Los Angeles' COVID-19 Behind Bars Data Project examined prison data from all states, the District of Columbia, and the Federal Bureau of Prisons from publicly available data sources such as medical examiner reports, corrections department websites, media reports, and news releases.A total of 42,107 of 1,295,285 prisoners had been infected with the novel coronavirus, for a case rate of 3.25%, versus 0.59% in the general US population.