Nationally Notifiable Infectious Diseases and Conditions, United States: Weekly Tables
(Starting week 1 of year 2020, Figure 1 will be discontinued.)
![The figure is a bar chart showing selected notifiable disease reports for the United States with comparison of provisional 4-week totals through February 2, 2019, with historical data. Reports of acute hepatitis A, legionellosis and measles increased with acute hepatitis A increasing beyond historical limits. Reports of giardiasis, acute hepatitis B, acute hepatitis C, meningococcal disease, mumps and pertussis decreased.](/nndss/static/2019/05/2019-05-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.