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Polymerase chain reaction for the laboratory diagnosis of aseptic meningitis and encephalitis

M Chesky1, R Scalco, L Failace

  • 1Immunology Unit, Hospital de Clínicas de Porto Alegre, Universidade Federal do Rio Grande do Sul, Brasil.

Arquivos De Neuro-Psiquiatria
|October 6, 2000
PubMed

Insights

A new PCR protocol enhances the diagnosis of central nervous system infections by detecting multiple pathogens in cerebrospinal fluid. This method improved diagnostic accuracy in our laboratory, identifying 12% of infections.

Area of Science:

  • Clinical Microbiology
  • Infectious Diseases
  • Molecular Diagnostics

Background:

  • Central nervous system (CNS) infections pose significant diagnostic challenges.
  • Timely and accurate diagnosis is crucial for effective patient management and treatment.
  • Conventional diagnostic methods may have limitations in sensitivity and speed.

Purpose of the Study:

  • To develop and evaluate a comprehensive PCR-based protocol for the simultaneous detection of a wide range of pathogens causing CNS infections.
  • To assess the diagnostic yield of the developed PCR protocol in a prospective cohort of patients.

Main Methods:

  • A multiplex PCR protocol was designed to detect 17 different microbial targets, including viruses, bacteria, and protozoa.
  • Cerebrospinal fluid (CSF) specimens from 383 patients were prospectively tested using the developed PCR assays.
  • Results were analyzed to determine the prevalence of detected microorganisms and the overall positivity rate.

Main Results:

  • Out of 383 CSF specimens tested, 46 (12.0%) yielded positive results.
  • Detected pathogens included Cytomegalovirus (CMV), enterovirus, Epstein-Barr virus, herpes simplex virus, human herpes virus type 6, JC virus, Listeria monocytogenes, Mycobacterium genus, Toxoplasma gondii, and varicella zoster virus.
  • The PCR protocol demonstrated effectiveness in identifying a variety of infectious agents in CNS specimens.

Conclusions:

  • The implementation of this PCR protocol has significantly improved the laboratory diagnosis of various CNS infections.
  • Further evaluation is warranted, particularly in immunocompromised patient populations, to fully ascertain the predictive value of positive PCR results.

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