CDC comparison of provisional 4-week totals May 21, 2016, with historical data. The ratio log scale is of current 4-week total to mean of 15 4-week totals (from previous, comparable, and subsequent 4-week periods for the past 5 years). The point where the hatched area begins is based on the mean and two standard deviations of these 4-week totals. View all the Notifiable Diseases and Mortality Tables

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