Nationally Notifiable Infectious Diseases and Conditions, United States: Weekly Tables
![Figure I. Selected notifiable disease reports, United States, comparison of provisional 4-week totals September 16, 2017, with historical data.](/nndss/static/2017/37/2017-37-figure1.jpg)
- * Ratio 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.