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Rapid antigen assay for the diagnosis of pneumococcal bacteremia in children: a preliminary study
Mark I Neuman1, Marvin B Harper
1Division of Emergency Medicine, Children's Hospital, Boston, MA 02115, USA. neuman@a1.tch.harvard.edu
Insights
A new assay for Streptococcus pneumoniae (S pneumoniae) shows high sensitivity in children with bacteremia and high specificity in afebrile children. This rapid diagnostic tool aids in identifying pneumococcal infections.
Area of Science:
- Pediatric infectious diseases
- Diagnostic assay development
- Microbiology
Background:
- Streptococcus pneumoniae (S pneumoniae) is a leading cause of bacterial infections in children.
- Accurate and rapid diagnostic tools are crucial for timely treatment of S pneumoniae infections.
- Current diagnostic methods may have limitations in sensitivity or specificity.
Purpose of the Study:
- To evaluate the sensitivity of a novel S pneumoniae antigen assay in children diagnosed with S pneumoniae bacteremia.
- To determine the specificity of the same assay in afebrile children without signs of pneumococcal infection.
Main Methods:
- Two groups of children aged 3 months to 5 years were enrolled in an urban pediatric setting.
- The study group comprised children with confirmed S pneumoniae bacteremia.
- The control group consisted of afebrile children without apparent focal bacterial infections, excluding those with recent S pneumoniae diagnoses.
Main Results:
- The assay correctly identified S pneumoniae in 23 out of 24 bacteremic children, achieving 95.8% sensitivity.
- In the control group, the assay yielded negative results for 67 out of 72 children, demonstrating 93.0% specificity.
- The assay showed high accuracy in distinguishing between infected and non-infected children in the study populations.
Conclusions:
- The S pneumoniae antigen assay exhibits significant sensitivity and specificity in pediatric populations.
- The assay is a promising tool for diagnosing S pneumoniae bacteremia in children.
- Further research is recommended to assess its utility in febrile children at risk for invasive pneumococcal disease.
Study Objective:
We determine the sensitivity of a new Streptococcus pneumoniae antigen assay in children with S pneumoniae bacteremia and also determine the specificity of the assay in afebrile children without apparent pneumococcal infection.
Methods:
We enrolled 2 groups of children, 3 months to 5 years of age, presenting to an urban pediatric emergency department or hospital-based clinic between January 1, 2000, and January 1, 2001. The study group included patients with S pneumoniae bacteremia. The control group included patients without fever or identified focal bacterial infection (other than a urinary tract infection). We excluded from the control group patients with a recent diagnosis (prior 4 weeks) of bacteremia, pneumonia, meningitis, acute otitis media, or other suspected S pneumoniae infection.
Results:
Ninety-six patients were enrolled: 24 children with S pneumoniae bacteremia and 72 afebrile control patients. The assay produced a positive result in 23 of 24 patients with pneumococcal bacteremia, yielding a sensitivity of 95.8% (95% confidence interval [CI] 78.9% to 99.9%). The test result was negative in 67 of 72 afebrile patients without apparent pneumococcal infection, yielding a specificity in this population of 93.0% (95% CI 83.4% to 97.5%).
Conclusion:
This S pneumoniae assay demonstrated high sensitivity for the defined bacteremic population, as well as high specificity among afebrile children without apparent pneumococcal infection. Further study in febrile children at risk of pneumococcal bacteremia is needed before the value of the test in children at risk for invasive pneumococcal disease can be determined.
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