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Updated: Apr 20, 2026
Author Spotlight: Advancing Rapid Detection of Respiratory Pathogens Using Microfluidic Chip
Published on: March 29, 2024
Detection of pneumonia associated pathogens using a prototype multiplexed pneumonia test in hospitalized patients
Berit Schulte1, Holm Eickmeyer2, Alexandra Heininger3
1Institute of Medical Microbiology and Hygiene, University of Tübingen, Tübingen, Germany; German Centre for Infection Research (DZIF), partner site Tübingen, Tübingen, Germany.
Unlabelled:
Severe pneumonia remains an important cause of morbidity and mortality. Polymerase chain reaction (PCR) has been shown to be more sensitive than current standard microbiological methods--particularly in patients with prior antibiotic treatment--and therefore, may improve the accuracy of microbiological diagnosis for hospitalized patients with pneumonia. Conventional detection techniques and multiplex PCR for 14 typical bacterial pneumonia-associated pathogens were performed on respiratory samples collected from adult hospitalized patients enrolled in a prospective multi-center study. Patients were enrolled from March until September 2012. A total of 739 fresh, native samples were eligible for analysis, of which 75 were sputa, 421 aspirates, and 234 bronchial lavages. 276 pathogens were detected by microbiology for which a valid PCR result was generated (positive or negative detection result by Curetis prototype system). Among these, 120 were identified by the prototype assay, 50 pathogens were not detected. Overall performance of the prototype for pathogen identification was 70.6% sensitivity (95% confidence interval (CI) lower bound: 63.3%, upper bound: 76.9%) and 95.2% specificity (95% CI lower bound: 94.6%, upper bound: 95.7%). Based on the study results, device cut-off settings were adjusted for future series production. The overall performance with the settings of the CE series production devices was 78.7% sensitivity (95% CI lower bound: 72.1%) and 96.6% specificity (95% CI lower bound: 96.1%). Time to result was 5.2 hours (median) for the prototype test and 43.5 h for standard-of-care. The Pneumonia Application provides a rapid and moderately sensitive assay for the detection of pneumonia-causing pathogens with minimal hands-on time.
Trial Registration:
Deutsches Register Klinischer Studien (DRKS) DRKS00005684.
Insights
Polymerase chain reaction (PCR) offers improved accuracy for diagnosing severe pneumonia in hospitalized patients. This rapid test detects pneumonia pathogens faster than standard methods, aiding clinical decisions.
Area of Science:
- Clinical microbiology
- Infectious diseases
- Molecular diagnostics
Background:
- Severe pneumonia is a significant cause of illness and death.
- Current diagnostic methods for pneumonia may lack sensitivity, especially after antibiotic treatment.
- Accurate and rapid pathogen identification is crucial for effective pneumonia management.
Purpose of the Study:
- To evaluate the performance of a multiplex polymerase chain reaction (PCR) assay for detecting bacterial pathogens in hospitalized pneumonia patients.
- To compare the accuracy and speed of the PCR test against standard microbiological methods.
- To assess the potential of PCR to improve the microbiological diagnosis of pneumonia.
Main Methods:
- A prospective, multi-center study enrolled adult hospitalized patients with pneumonia from March to September 2012.
- Respiratory samples (sputa, aspirates, bronchial lavages) were analyzed using conventional methods and a multiplex PCR prototype.
- The Curetis prototype system was used for PCR-based pathogen detection, with results compared to standard microbiology.
Main Results:
- The PCR prototype assay demonstrated a sensitivity of 70.6% and specificity of 95.2% for pathogen identification.
- After adjusting device settings, the CE series production devices achieved 78.7% sensitivity and 96.6% specificity.
- The median time to result for the PCR test was 5.2 hours, significantly faster than the 43.5 hours for standard-of-care.
Conclusions:
- The multiplex PCR assay provides a rapid and moderately sensitive method for detecting pneumonia-causing pathogens.
- The test requires minimal hands-on time, making it a valuable tool for clinical settings.
- The improved turnaround time of PCR can potentially enhance the timely diagnosis and treatment of pneumonia.
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