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Vol. 15. Issue 4.
Pages 370-376 (July - August 2011)
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Vol. 15. Issue 4.
Pages 370-376 (July - August 2011)
Brief communication
Open Access
Risk factors for bloodstream infections caused by extended-spectrum β-lactamase-producing Escherichia coli and Klebsiella pneumoniae
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Olivia Ferrández Quirante1, Santiago Grau Cerrato2,
Corresponding author
94007@hospitaldelmar.cat

Correspondence to: Hospital del Mar. Pg, Marítim, 25–29, CP 08003, Barcelona.
, Sonia Luque Pardos1
1 Clinical Pharmacist, Hospital del Mar, Barcelona, Spain
2 Infectious Diseases Pharmacist, Hospital del Mar, Barcelona, Spain
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Abstract

The objective of this study was to identify risk factors for bacteremia by extended-spectrum β-lactamase (ESBL)-producing Escherichia coli and Klebsiella pneumoniae. Retrospective case-control study performed in a 450-bed acute care academic tertiary hospital in Barcelona, Spain. Cases included 53 patients with ESBL-producing E. coli or K. pneumoniae bacteremia, and 159 controls with non-ESBL-producing E. coli or K. pneumoniae bacteremia. Controls were matched in a 3:1 ratio to case patients according to species of infecting organism, age, and severity of illness in the 24-48h before blood sample collection for culture calculated by the Simplified Acute Physiology Score (SAPS II) system. Previous antimicrobials were more frequently administered to cases than to controls (56.5% vs 17%, p<0.001). Binary logistic regression showed that the number (>2) of different families of antimicrobials received within 90 days before bloodstream infection was the only predictor of ESBL-producing E. coli or K. pneumoniae in blood culture (OR=2.29, 95% CI 1.35−3.88, p=0.002).

Conclusion

Previous use of different families of antimicrobials (more than two) in patients with bloodstream infection caused by E. coli or K. pneumoniae increased the risk for ESBL-producing strains.

Keywords:
bacteremia
β-lactamases
risk factors
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