Evaluation of Sofia Fluorescent immunoassay analyzer for pneumococcal urinary antigen detection in hospitalized...

Area of Science:

• Clinical microbiology
• Infectious diseases
• Diagnostic test evaluation

Background:

• Community-acquired pneumonia (CAP) is a significant cause of morbidity and mortality.
• Streptococcus pneumoniae remains a leading bacterial cause of CAP.
• Rapid and accurate diagnostic methods for pneumococcal pneumonia are crucial for timely treatment.

Purpose of the Study:

• To prospectively evaluate the performance of the Sofia Streptococcus pneumoniae FIA® test.
• To assess the test's ability to detect pneumococcal urinary antigen in hospitalized patients with CAP.
• To determine the sensitivity and specificity of the test in diagnosing pneumococcal CAP.

Main Methods:

• Prospective evaluation of the Sofia Streptococcus pneumoniae FIA® test.
• Inclusion of 106 hospitalized patients diagnosed with community-acquired pneumonia.
• Analysis of non-concentrated urine samples for pneumococcal urinary antigen detection.

Main Results:

• The Sofia test detected pneumococcal urinary antigen in 77.4% of confirmed pneumococcal CAP episodes (24/31).
• The test demonstrated a specificity of 86.7% in the evaluated patient cohort.
• Urine heating improved the test's specificity to 92%.

Conclusions:

• The Sofia Streptococcus pneumoniae FIA® test is a valuable tool for detecting pneumococcal urinary antigen in patients with CAP.
• The test shows good sensitivity and specificity, particularly with urine pre-treatment.
• This assay can aid in the rapid diagnosis of pneumococcal pneumonia, guiding appropriate antimicrobial therapy.