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CSF bacterial antigen detection tests offer no advantage over Gram's stain in the diagnosis of bacterial meningitis

J Mein1, G Lum

  • 1Microbiological Laboratory, Royal Darwin Hospital, Northern Territory, Australia.

Pathology
|April 23, 1999
PubMed

Insights

Bacterial antigen detection (BAD) tests for cerebrospinal fluid (CSF) are not sensitive enough for diagnosing bacterial meningitis in developed settings. Routine Gram

Area of Science:

  • Clinical microbiology
  • Infectious disease diagnostics
  • Neuroscience research

Background:

  • Bacterial antigen detection (BAD) tests for cerebrospinal fluid (CSF) are used in developing countries.
  • Their utility in developed nations with advanced diagnostics is questioned.
  • Darwin, NT, has high infectious disease rates, necessitating local diagnostic evaluation.

Purpose of the Study:

  • To assess the diagnostic utility of BAD tests for bacterial meningitis in Darwin.
  • To evaluate BAD test performance against clinical and laboratory data.
  • To determine the cost-effectiveness of BAD tests in this setting.

Main Methods:

  • Retrospective review of hospital records and microbiology reports over 19 months.
  • Inclusion of a clinical component for bacterial meningitis case definition.
  • Calculation of sensitivity, specificity, and positive predictive value for BAD tests.

Main Results:

  • BAD tests demonstrated 28.6% sensitivity and 98.7% specificity for bacterial meningitis.
  • Positive predictive value was 85.7%, with a cost of $240 per positive test.
  • No bacterial meningitis cases positive by BAD test were missed by Gram's stain.

Conclusions:

  • BAD tests alone lack sufficient sensitivity for confident bacterial meningitis diagnosis in this setting.
  • BAD tests are more costly and offer no speed advantage over Gram's stain.
  • Gram's stain remains a reliable and cost-effective diagnostic method for bacterial meningitis.

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