New PCR Test Targets Hidden Bacteremia
Researchers evaluate a host-response-focused diagnostic approach for detecting bloodstream infections using small blood volumes
Objective:
To improve detection of bacteremia by identifying bacterial DNA inside circulating neutrophils.
Key Findings:
- ddcPCR detected neutrophils containing S. aureus DNA in six cases, while blood cultures identified S. aureus in three cases.
- Four patients tested positive by ddcPCR despite negative blood cultures, likely due to prior antibiotic treatment.
- The assay can detect infected cells representing as little as 0.05 percent of neutrophils.
Interpretation:
The study suggests that measuring the host immune response alongside pathogen detection may enhance identification of bloodstream infections.
Limitations:
- Performance was reduced in patients with severe neutropenia or hematologic malignancies due to low normal neutrophil availability.
- ddcPCR is not intended to replace blood cultures but to complement them.
Conclusion:
ddcPCR could serve as a complementary tool for faster assessment of suspected bacteremia and support earlier treatment decisions.
