Improved Sensitivity for Respiratory Pathogen Detection in Bronchoalveolar Lavage from Lung Transplant Recipients...

Area of Science:

• Medical Microbiology
• Genomics
• Transplant Surgery

Background:

• Pulmonary infections pose a significant threat to lung transplant recipients (LTRs).
• Accurate and timely pathogen detection is crucial for effective treatment in LTRs.
• Conventional culture methods may have limitations in sensitivity and speed for diagnosing these infections.

Purpose of the Study:

• To compare the diagnostic performance of next-generation sequencing (NGS) against conventional cultures (CC) for identifying pathogens in bronchoalveolar lavage (BAL) samples from LTRs.
• To assess the impact of incorporating NGS into the diagnostic workflow for pulmonary infections in LTRs.

Main Methods:

• Retrospective analysis of bronchoalveolar lavage (BAL) specimens from 31 LTRs (122 bronchoscopies).
• Parallel testing of specimens using both conventional cultures (CC) and next-generation sequencing (NGS).
• Comparison of sensitivity and specificity of NGS and CC against a composite reference standard for infection.

Main Results:

• NGS demonstrated significantly higher broad-range sensitivity (74.2%) compared to CC (50.5%) for detecting infection (p=0.0016).
• The combination of NGS and CC (77.4%) further improved sensitivity.
• CC exhibited higher specificity (100%) than NGS (86.2%) (p=0.049).
• For pathogens already detected by CC, NGS showed high pooled sensitivity (82.1%), specificity (98.7%), and accuracy (98.6%).

Conclusions:

• Integrating NGS into the diagnostic process improves the detection of pulmonary pathogens in lung transplant recipients.
• NGS offers a valuable adjunctive tool for the microbiologic workup of pulmonary infections in immunocompromised patients post-lung transplantation.