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Routine quantitative blood cultures in children with Haemophilus influenzae or Streptococcus pneumoniae bacteremia
Insights
Quantitative blood cultures help assess infection severity in children. Higher bacterial levels correlate with severe disease, like meningitis, aiding risk identification for invasive infections.
Area of Science:
- Pediatric Infectious Diseases
- Clinical Microbiology
- Diagnostic Bacteriology
Background:
- Bacteremia in children requires accurate assessment of severity and prognosis.
- Quantitative blood cultures (QBC) offer potential insights into infection magnitude.
- Distinguishing invasive disease from occult bacteremia is clinically important.
Purpose of the Study:
- To evaluate the clinical utility of QBC using a lysis-direct plating method.
- To correlate bacterial load with infection severity in pediatric bacteremia.
- To assess the role of QBC in identifying children at risk for invasive disease.
Main Methods:
- Prospective study of 50 children with Haemophilus influenzae or Streptococcus pneumoniae bacteremia.
- Utilized a commercially available lysis-direct plating method for quantitative blood cultures.
- Correlated colony-forming units per milliliter (CFU/mL) with clinical presentation and diagnosis.
Main Results:
- Bacteremia magnitude correlated significantly with infection severity.
- Patients with ≥100 CFU/mL were more likely to have meningitis (P < .01).
- S. pneumoniae bacteremia with <15 CFU/mL was associated with occult bacteremia.
Conclusions:
- Quantitative blood culture results correlate with disease severity in pediatric bacteremia.
- Higher bacterial loads indicate a greater risk of invasive complications.
- QBC may aid in risk stratification and management decisions for children with bacteremia.
Abstract:
The potential clinical value of quantitative blood cultures determined by a commercially available lysis-direct plating method was studied in 50 children with either Haemophilus influenzae or Streptococcus pneumoniae bacteremia. The magnitude of bacteremia correlated with the severity of the infection; patients with greater than or equal to 100 colony-forming units per milliliter were significantly more likely to have meningitis (P less than .01, chi 2 = 7.5). On the other hand, all patients with S. pneumoniae bacteremia with colony counts lower than 15 colony-forming units per milliliter had "occult bacteremia" with no focus of infection. The data suggest that patients with higher levels of bacteremia have more severe disease. Quantitative blood culture results may be helpful in identifying which children are at risk for invasive disease.