Related Experiment Video
Updated: Jan 16, 2026
Author Spotlight: Advancing Pathogen Detection and Disease Assessment in Real-Time Using M-ROSE
Published on: March 1, 2024
Pneumocystis jirovecii Pneumonia Diagnosis with Oropharyngeal Wash PCR in Immunocompromised Patients-A Systematic
Vasco Salgado Costa1,2, José Pedro Cidade1,2, Inês Medeiros1
1Department of Critical Care Medicine, Hospital de São Francisco Xavier, Unidade Local de Saúde Lisboa Ocidental (ULSLO), Estrada Forte do Alto Duque, 1449-005 Lisbon, Portugal.
Abstract:
Background/Objectives:Pneumocystis jirovecii pneumonia (PJP) remains a major cause of morbidity and mortality in immunocompromised patients. Bronchoalveolar lavage (BAL) is the diagnostic gold standard but is invasive and often impractical in critically ill patients. Oropharyngeal wash (OW) polymerase chain reaction (PCR) offers a rapid, non-invasive alternative. We performed a systematic review focusing on this respiratory sample's diagnostic accuracy and clinical utility. Methods: We searched PubMed, Scopus, Web of Science, Cochrane Library, and clinical trial registries including ClinicalTrials.gov and MedRxiv for studies of PCR-based P. jirovecii detection in OW samples from immunocompromised adults, using BAL or induced sputum as reference standards. The Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) methodology was followed. Quality was assessed with Quality Assessment of Diagnostic Accuracy Studies-2 (QUADAS-2), and pooled sensitivity/specificity were estimated using a bivariate random-effects model. Results: Twelve studies (n = 633; 346 confirmed PJP cases) met the inclusion criteria. Most cohorts were human immunodeficiency virus (HIV)-positive. Pooled sensitivity was 68.3% (95% CI: 59.2-75.9) and specificity 91.8% (95% CI: 85.9-95.3); the area under the summary receiver operating characteristic curve (AUC) was 0.887. Diagnostic yield improved with pre-sample cough induction, 60-s gargling, early sampling before extended therapy, and higher fungal loads. Risk of bias was low, and no significant publication bias was detected. Conclusions: OW-based PCR delivers high specificity and moderate sensitivity for PJP diagnosis, offering a safe, scalable, and patient-friendly alternative when invasive testing is unfeasible. Optimizing collection protocols and expanding evaluation to non-HIV immunosuppressed populations could enhance its role as an early screening tool, enabling faster treatment decisions and reducing unnecessary antimicrobial exposure.
Insights
Oropharyngeal wash (OW) polymerase chain reaction (PCR) provides a safe and effective non-invasive method for diagnosing Pneumocystis jirovecii pneumonia (PJP). This diagnostic approach offers high specificity, making it a valuable tool when invasive testing is not feasible.
Area of Science:
- Infectious Diseases
- Diagnostic Microbiology
- Pulmonology
Background:
- Pneumocystis jirovecii pneumonia (PJP) is a significant cause of illness and death in immunocompromised individuals.
- Bronchoalveolar lavage (BAL) is the standard diagnostic method but is invasive and challenging for critically ill patients.
Purpose of the Study:
- To systematically review the diagnostic accuracy and clinical utility of oropharyngeal wash (OW) polymerase chain reaction (PCR) for PJP detection.
- To evaluate OW-PCR as a non-invasive alternative to traditional diagnostic methods.
Main Methods:
- Systematic review of 12 studies involving PCR-based PJP detection in OW samples from immunocompromised adults.
- Bronchoalveolar lavage (BAL) or induced sputum served as reference standards.
- Bivariate random-effects modeling was used to estimate pooled sensitivity and specificity.
Main Results:
- Pooled sensitivity for OW-PCR was 68.3% (95% CI: 59.2-75.9) and pooled specificity was 91.8% (95% CI: 85.9-95.3).
- The area under the receiver operating characteristic curve (AUC) was 0.887, indicating good diagnostic performance.
- Diagnostic yield was improved by cough induction, prolonged gargling, early sampling, and higher fungal loads.
Conclusions:
- OW-PCR is a highly specific and moderately sensitive diagnostic tool for PJP, suitable for immunocompromised patients.
- This non-invasive method offers a safe, scalable, and patient-friendly alternative when invasive diagnostics are not practical.
- Optimizing collection protocols and broadening evaluation to non-HIV populations could enhance its utility as an early screening tool.
Related Concept Videos
01:30Pneumonia III: Complications and Assessment
01:30Pneumonia I: Introduction
Risk Factors
Various factors influence the likelihood of developing pneumonia. Age plays a crucial role, with infants, children under two, and individuals over 65 at increased risk due to their...
01:27Chronic Obstructive Pulmonary Disease-IV: Assessement and Diagnostic Studies
Medical History
01:25Transmission-based Precautions II: Airborne and Protective Environment
Airborne precautions:
Use airborne precautions when treating patients known or suspected to have diseases that spread through the air—for example, tuberculosis or measles. These organisms are present in smaller droplets expelled by an infected person and...
01:20Sputum Studies II: Culture and Sensitivity
Sputum culture and sensitivity is a medical procedure used to diagnose bacterial infections in the respiratory tract and select the most appropriate antibiotics for treatment. This process involves analyzing sputum samples of thick and opaque secretions produced in the lungs and airways. These samples are collected from patients and then sent to the laboratory for analysis.
The test can identify various pathogens responsible for respiratory infections, including Streptococcus,...
01:29Pulmonary Embolism II: Diagnostic Studies and Interprofessional Care