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Comparison of the COVID-19 crude case fatality ratio (X axis = total deaths/total cases), cumulative incidence (Y axis = total cases/total population), and mortality (the isoline = total deaths/total population) of 30 states of the USA with more than 50 fatal cases by April 8, 2020. The size of balloon was proportional to the state's population size. The small rope of the balloon traced the history of changes related to CI and CFR in the past 7 days. M=million.
