A promising new test to detect Streptococcus pneumoniae urinary antigen

Area of Science:

• Clinical Microbiology
• Infectious Diseases
• Diagnostic Testing

Background:

• Streptococcus pneumoniae is a primary cause of community-acquired pneumonia (CAP).
• Rapid urinary antigen detection is crucial for timely Streptococcus pneumoniae CAP diagnosis.

Purpose of the Study:

• To compare the diagnostic performance of the Sofia® Strep pneumoniae FIA test against the BinaxNOW® Strep pneumoniae test.
• To evaluate the clinical utility of a novel immunofluorescence assay for Streptococcus pneumoniae antigen detection.

Main Methods:

• A comparative study involving 133 non-concentrated urine samples.
• Utilized both BinaxNOW® Strep pneumoniae (colorimetric) and Sofia® Strep pneumoniae FIA (immunofluorescence) assays.

Main Results:

• The Sofia® test identified 20 positive cases, while BinaxNOW® identified 11.
• The Sofia® test enabled the diagnosis of 7 additional cases (5.2% increase).
• Overall agreement between the two tests was good, with improved sensitivity for Sofia®.

Conclusions:

• The Sofia® Strep pneumoniae FIA test demonstrates enhanced detection capabilities for Streptococcus pneumoniae in CAP.
• The immunofluorescence method of Sofia® may account for its improved performance over the colorimetric BinaxNOW® test.
• Sofia® offers advantages including LIS connectivity for automated traceability, streamlining laboratory workflows.