Predicting Influenza Infections during Epidemics with Use of a Clinical Case Definition

Abstract
Combined pharyngeal and nasal swab specimens were collected from 100 subjects who presented with a flu-like illness (fever>37.8°C plus 2 of 4 symptoms: cough, myalgia, sore throat, and headache) of 38°C) and cough for the diagnosis of influenza infection during this flu season were 86.8%, 39.3%, 77.6%, and 55.0%, respectively.