Diagnostic tests for influenza infection

Area of Science:

• Virology
• Infectious Diseases
• Diagnostic Medicine

Background:

• The 2009 H1N1 pandemic highlighted the critical need for rapid and accurate influenza diagnostics.
• Existing diagnostic methods vary in sensitivity and specificity, particularly for novel influenza strains.

Purpose of the Study:

• To review current influenza diagnostic tests and emerging developments.
• To assess the performance of diagnostic methods during the 2009 H1N1 pandemic.

Main Methods:

• Review of current literature on influenza diagnostic testing.
• Analysis of test performance data, focusing on sensitivity and specificity for 2009 H1N1.

Main Results:

• Rapid antigen and immunofluorescence tests demonstrated reduced sensitivity for 2009 H1N1 compared to seasonal influenza.
• Molecular testing showed high sensitivity, speed, and ability to identify viral subtypes, with adoption expected to increase.
• Variability in test performance across different settings and sample collection times was noted, impacting accuracy.

Conclusions:

• Influenza diagnostic test performance is influenced by viral evolution, necessitating annual re-evaluation.
• Optimizing laboratory procedures and improving sample quality are crucial for accurate influenza diagnosis.
• Manufacturers are developing improved immunoassays and faster molecular tests to enhance pandemic preparedness.