The figure above is a bar chart showing selected notifiable disease reports for the United States with comparison of provisional 4-week totals through January 27, 2018, with historical data. Reports of acute hepatitis A, measles and meningococcal disease increased with acute hepatitis A increasing beyond historical limits. Reports of giardiasis, acute hepatitis B, acute hepatitis C, legionellosis, mumps and pertussis decreased with giardiasis decreasing beyond historical limits.