Improving Diagnosis of Invasive Aspergillosis with PCR
Author Information
Author(s): Khot Prasanna D, Ko Daisy L, Hackman Robert C, Fredricks David N
Primary Institution: Fred Hutchinson Cancer Research Center
Hypothesis
The majority of Aspergillus DNA in bronchoalveolar lavage fluid is present in intact cells, and concentrating this cellular fraction will improve detection rates.
Conclusion
The Aspergillus qPCR assay detected Aspergillus DNA in 76.9% of subjects with proven or probable IPA when the concentrated BAL fluid pellet fraction was used for diagnosis.
Supporting Evidence
- The qPCR assay showed a sensitivity of 76.9% for detecting IPA.
- Culture methods had a sensitivity of 84.6% for IPA diagnosis.
- Using both extraction and amplification controls improved the reliability of the qPCR results.
Takeaway
Researchers found a better way to detect a fungus called Aspergillus in patients' lung fluid, which can help doctors treat infections faster.
Methodology
BAL fluid from 94 episodes of pneumonia in 81 patients was analyzed using quantitative PCR to detect Aspergillus DNA.
Potential Biases
Potential for false positives due to contamination during sample collection or processing.
Limitations
The study's sensitivity may have been impacted by the variability in the BAL procedure and the volume of fluid processed.
Participant Demographics
Patients included 60 who underwent hematopoietic cell transplantation and others with various hematological malignancies.
Statistical Information
P-Value
p<0.01
Confidence Interval
95% C.I. of 0.85 – 0.97
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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