Document Detail

Clustering of Serratia marcescens infections in a neonatal intensive care unit.
MedLine Citation:
PMID:  15484795     Owner:  NLM     Status:  MEDLINE    
OBJECTIVES: To study clusters of infections caused by Serratia marcescens in a neonatal intensive care unit (NICU) and to determine risk factors for S. marcescens infection or colonization. DESIGN: Genotyping of S. marcescens isolates was performed by pulsed-field gel electrophoresis (PFGE). A retrospective case-control study was conducted. SETTING: A tertiary-care pediatric hospital with a 16-bed NICU. PATIENTS: All neonates with at least one culture positive for S. marcescens in the NICU during December 1999 to July 2002. Case-patients (n = 11) treated in the NICU during December 1999 to February 2000 were included in the case-control study. Neonates treated in the NICU for at least 72 hours during the same period with cultures negative for S. marcescens were used as control-patients (n = 27). RESULTS: S. marcescens was cultured from 19 neonates; 9 were infected and 10 were colonized. PFGE analysis identified three epidemic strains; each cluster consisted of identical isolates, except one isolate in the first cluster that was different. The risk factors identified were low birth weight, prematurity, prolonged respiratory therapy, prolonged use of antibiotics, and maternal infection prior to delivery. Overcrowding and understaffing were recorded simultaneously with the clusters. CONCLUSIONS: PFGE analysis showed three independent clusters. Several factors contributed to spread of the epidemic strains: (1) there were many severely premature and susceptible neonates, (2) the NICU was overcrowded during the clusters, and (3) transmission was likely to occur via the hands of staff. Cohorting and improvement of routine infection control measures led to the cessation of each cluster.
Emmi Sarvikivi; Outi Lyytikäinen; Saara Salmenlinna; Jaana Vuopio-Varkila; Päivi Luukkainen; Eveliina Tarkka; Harri Saxén
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Infection control and hospital epidemiology : the official journal of the Society of Hospital Epidemiologists of America     Volume:  25     ISSN:  0899-823X     ISO Abbreviation:  Infect Control Hosp Epidemiol     Publication Date:  2004 Sep 
Date Detail:
Created Date:  2004-10-15     Completed Date:  2004-12-15     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8804099     Medline TA:  Infect Control Hosp Epidemiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  723-9     Citation Subset:  IM; N    
Hospital for Children and Adolescents, Helsinki, Finland.
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MeSH Terms
Case-Control Studies
Cross Infection / epidemiology,  genetics,  prevention & control*
Disease Outbreaks / prevention & control*
Electrophoresis, Gel, Pulsed-Field
Finland / epidemiology
Infant, Newborn
Infant, Premature*
Intensive Care Units, Neonatal
Logistic Models
Microbial Sensitivity Tests
Risk Factors
Serratia Infections / epidemiology,  genetics,  prevention & control*
Serratia marcescens / genetics*
Statistics, Nonparametric

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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