Related Experiment Video

Updated: Jul 4, 2026

Multiplex Detection of Bacteria in Complex Clinical and Environmental Samples using Oligonucleotide-coupled Fluorescent Microspheres
11:09

Multiplex Detection of Bacteria in Complex Clinical and Environmental Samples using Oligonucleotide-coupled Fluorescent Microspheres

Published on: October 23, 2011

[Multiplex PCR assay in spinal fluid to identify simultaneously bacterial pathogens associated to acute bacterial

Marcelo Reyes S1, Juan Pablo Torres T, Valeria Prado J

  • 1Programa de Microbiología, Instituto de Ciencias Biomédicas, Facultad de Medicina, Universidad de Chile, Santiago, Chile.

Revista Medica De Chile
|June 26, 2008
PubMed
Abstract

Insights

A new multiplex Polymerase Chain Reaction (PCR) protocol accurately detects key bacteria causing acute bacterial meningitis (ABM). This method improves pathogen identification in cerebrospinal fluid (CSF) samples, especially for patients previously treated with antibiotics.

Area of Science:

  • Microbiology
  • Molecular Diagnostics
  • Infectious Diseases

Background:

  • Acute bacterial meningitis (ABM) requires rapid diagnosis for effective treatment.
  • Key etiological agents include Streptococcus pneumoniae, Neisseria meningitidis, and Haemophilus influenzae type b.
  • Current pathogen detection rates in Chile for ABM patients are 83%.

Purpose of the Study:

  • To evaluate a novel multiplex Polymerase Chain Reaction (PCR) protocol for the simultaneous detection of common pathogens in patients with suspected ABM.
  • To assess the diagnostic accuracy of the developed PCR assay.

Main Methods:

  • A multiplex PCR protocol was designed to identify specific genes of S. pneumoniae (pspA, ply), N. meningitidis (ctrA, crgA), and H. influenzae type b (bexA).
  • The protocol was evaluated using cerebrospinal fluid (CSF) samples from pediatric patients with suspected ABM.
  • Sensitivity, specificity, and minimum DNA detection levels were determined. 16S rRNA gene amplification confirmed bacterial DNA extraction.

Main Results:

  • The study analyzed 99 CSF samples (90 from children with fever and negative cultures, 9 from confirmed ABM patients).
  • The multiplex PCR protocol demonstrated high performance: 89% sensitivity, 100% specificity, 100% positive predictive value, and 99% negative predictive value.
  • A high concordance of 89% was observed between PCR results and traditional bacteriological cultures.

Conclusions:

  • The developed multiplex PCR protocol is a sensitive and specific tool for diagnosing acute bacterial meningitis.
  • This diagnostic approach can enhance pathogen identification rates, particularly in clinical settings involving patients who have undergone prior antibiotic treatment.
  • The PCR assay offers a valuable advancement for the rapid and accurate diagnosis of ABM.

More Related Videos

Metagenomic Next-Generation Sequencing of Cerebrospinal Fluid for the Detection of Central Nervous System Pathogens10:08

Metagenomic Next-Generation Sequencing of Cerebrospinal Fluid for the Detection of Central Nervous System Pathogens

Published on: April 17, 2026

Related Concept Videos

Viral Meningitis01:18

Viral Meningitis

Viral meningitis is the most common form of meningitis and is often referred to as aseptic meningitis to indicate the absence of bacterial involvement. It is generally milder than bacterial meningitis, with symptoms including fever, headache, stiff neck, drowsiness, nausea, photophobia, and vomiting. Rarely, more severe manifestations or death may occur. Common causative agents include enteroviruses, particularly coxsackie A and B viruses and echoviruses, all members of the Enterovirus genus...
Rapid Identification of Pathogens01:25

Rapid Identification of Pathogens

MALDI-TOF MS has transformed clinical microbiology by offering a rapid and reliable method for pathogen identification. The traditional approach to microbial identification typically involves time-consuming culture techniques and biochemical tests, which can delay the initiation of appropriate antimicrobial therapy. MALDI-TOF MS avoids these delays by using characteristic ribosomal protein mass patterns of microbial cells, enabling accurate species-level identification within minutes.Principle...