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National Notifiable Diseases Surveillance System

National surveillance for invasive Haemophilus influenzae, including type b or Hib, disease is conducted through the National Notifiable Diseases Surveillance System (NNDSS). NNDSS is a computerized public health surveillance information system that provides CDC with weekly data regarding cases of nationally notifiable diseases. Non-invasive H. influenzae disease is not nationally notifiable. Learn more about NNDSS.

Active Bacterial Core surveillance


Invasive H. influenzae, including Hib, disease is also tracked with active laboratory-based surveillance. This surveillance is conducted by the Emerging Infections Program's Active Bacterial Core surveillance (ABCs) to:

  • Determine the incidence and epidemiologic characteristics of invasive H. influenzae disease
  • Monitor impact of the Hib vaccination program
  • Detect possible emergence of disease due to non-type b H. influenzae
  • Determine appropriate verification and validation criteria for serotyping

View ABCs annual reports for H. influenzae disease.