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Pneumolysin PCR-based diagnosis of invasive pneumococcal infection in children

P Toikka1, S Nikkari, O Ruuskanen

  • 1Department of Pediatrics, Turku University Hospital, Turku, Finland. pia@toikka@utu.fi

Journal of Clinical Microbiology
|February 13, 1999
PubMed

Insights

Diagnosing pneumococcal infection in children requires multiple tests. Pneumolysin PCR is sensitive but needs multiple blood samples for optimal Streptococcus pneumoniae detection.

Area of Science:

  • Microbiology
  • Infectious Diseases
  • Molecular Diagnostics

Background:

  • Streptococcus pneumoniae causes significant childhood infections.
  • Accurate and rapid diagnosis of pneumococcal infections is crucial for effective treatment.
  • Current diagnostic methods have limitations in sensitivity and specificity.

Purpose of the Study:

  • To evaluate the diagnostic performance of blood-based pneumolysin PCR.
  • To compare pneumolysin PCR with other diagnostic assays for pneumococcal infection.
  • To assess the utility of multiple blood fractions in PCR-based diagnosis.

Main Methods:

  • Compared pneumolysin PCR in plasma, serum, and leukocytes against blood culture and immune complex detection.
  • Analyzed antibody responses to pneumolysin and C polysaccharide.
  • Included 75 febrile children with suspected invasive pneumococcal infection and 15 healthy controls.

Main Results:

  • Pneumolysin PCR was the most sensitive assay (44% positive in diagnosed cases).
  • Antibody increases and immune complexes were detected in 30-39% and 16-30% of patients, respectively.
  • Blood culture yielded positive results in 20% of patients; PCR was specific in healthy controls.

Conclusions:

  • Diagnosing Streptococcus pneumoniae infection necessitates a combination of diagnostic assays.
  • Pneumolysin PCR shows promise as a sensitive diagnostic tool but requires analysis of multiple blood fractions.
  • Further optimization is needed to enhance the clinical utility of pneumolysin PCR for pneumococcal infections.

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