Case Definition for Real-Time Surveillance of Influenza-like Illness

The Centers for Disease Control and Prevention case definition of influenza-like illness (ILI) as fever with cough and/or sore throat casts a wide net resulting in lower sensitivity which can have major implications on public health surveillance and response.

Objective

This study investigates additional signs and symptoms to further enhance the ILI case definition for real-time surveillance of influenza.