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Diagnostic accuracy of a serotype-specific antigen test in community-acquired pneumonia
Susanne M Huijts1, Michael W Pride, Josephine M I Vos
1University Medical Center Utrecht, Utrecht.
Abstract:
Our aim was to evaluate the diagnostic accuracy and clinical utility of a serotype-specific urinary antigen detection multiplex assay for identification of 13 pneumococcal serotypes (1, 3, 4, 5, 6A, 6B, 7F, 9V, 14, 18C, 19A, 19F and 23F) in urine of patients with community-acquired pneumonia. Adult patients with clinical suspicion of community-acquired pneumonia were included. In addition to standard diagnostic procedures, a urine sample was collected to perform the urinary antigen detection test. Demographic, clinical, radiological and microbiological data were collected. Among 1095 community-acquired pneumonia patients Streptococcus pneumoniae was identified as causative pathogen in 257 (23%), when using conventional diagnostic methods and in 357 (33%) when urinary antigen detection was added. Of the 49 bacteraemic episodes caused by one of the 13 serotypes covered by the urinary antigen detection, 48 were detected by the urinary antigen detection, indicating a sensitivity of 98%. Of the 77 community-acquired pneumonia episodes with a "non-urinary antigen detection" causative pathogen, none had a positive urinary antigen detection result, indicating a specificity of 100%. Addition of the urinary antigen detection test to conventional diagnostic methods increased the prevalence of S. pneumoniae community-acquired pneumonia by 39%. Using bacteraemic episodes as reference sensitivity and specificity of the urinary antigen detection was 98% and 100%, respectively.
Insights
A new urinary antigen detection multiplex assay accurately identifies Streptococcus pneumoniae in community-acquired pneumonia patients. This test significantly increases diagnostic yield, improving detection rates for this common bacterial infection.
Area of Science:
- Medical Microbiology
- Infectious Diseases
- Diagnostic Technology
Background:
- Community-acquired pneumonia (CAP) diagnosis relies on various methods.
- Accurate identification of Streptococcus pneumoniae is crucial for effective CAP management.
- Existing diagnostic tools may not cover all relevant pneumococcal serotypes.
Purpose of the Study:
- To assess the diagnostic accuracy and clinical utility of a serotype-specific urinary antigen detection multiplex assay.
- To identify 13 key pneumococcal serotypes in urine samples from CAP patients.
- To evaluate the assay's impact on the diagnosis of Streptococcus pneumoniae CAP.
Main Methods:
- Adult patients with suspected CAP were enrolled.
- Urine samples were tested using a multiplex urinary antigen detection assay alongside standard diagnostics.
- Demographic, clinical, radiological, and microbiological data were collected.
Main Results:
- Streptococcus pneumoniae was identified in 33% of CAP cases when the assay was added, versus 23% with conventional methods.
- The assay demonstrated 98% sensitivity and 100% specificity in detecting target pneumococcal serotypes.
- Addition of the assay increased the identified prevalence of S. pneumoniae CAP by 39%.
Conclusions:
- The serotype-specific urinary antigen detection multiplex assay is highly accurate for diagnosing pneumococcal CAP.
- This assay significantly enhances the diagnostic yield for Streptococcus pneumoniae.
- The test offers valuable clinical utility in managing community-acquired pneumonia.
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