Table 2.

Statistical parameters of IFA direct exam compared with CC

VirusNo. of specimensa:Sensitivity (%)Specificity (%)Positive predictive value (%)Negative predictive value (%)% Agree- ment
IFA positive and CC positiveIFA positive and CC negativeIFA negative and CC positive
Influenza A virus65112180.498.785.597.696.6
Influenza B virus1601257.1100.0100.098.898.7
Parainfluenza 3 virus40266.7100.0100.099.899.8
 Summary for all viruses208276576.296.088.590.990.3
  • a A total of 946 specimens met criteria for direct IFA examination.