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Evidence of Interhospital Transmission of Extended-Spectrum β-Lactam-Resistant Klebsiella pneumoniae in the United States, 1986 to 1993

Published online by Cambridge University Press:  02 January 2015

Dominique L. Monnet*
Affiliation:
Hospital Infections Program, Centers for Disease Control and Prevention, Atlanta, Georgia
James W. Biddle
Affiliation:
Hospital Infections Program, Centers for Disease Control and Prevention, Atlanta, Georgia
Jonathan R. Edwards
Affiliation:
Hospital Infections Program, Centers for Disease Control and Prevention, Atlanta, Georgia
David H. Culver
Affiliation:
Hospital Infections Program, Centers for Disease Control and Prevention, Atlanta, Georgia
James S. Tolson
Affiliation:
Hospital Infections Program, Centers for Disease Control and Prevention, Atlanta, Georgia
William J. Martone
Affiliation:
Hospital Infections Program, Centers for Disease Control and Prevention, Atlanta, Georgia
Fred C. Tenover
Affiliation:
Hospital Infections Program, Centers for Disease Control and Prevention, Atlanta, Georgia
Robert P. Gaynes
Affiliation:
Hospital Infections Program, Centers for Disease Control and Prevention, Atlanta, Georgia
*
Hospital Infections Program, MS E-55, Centers for Disease Control and Prevention, Atlanta, GA 30333

Abstract

Background:

In addition to single-hospital outbreaks, interhospital transmission of extended-spectrum β-lactam-resistant (ESBLR) Klebsiella pneumoniae has been suspected in some reports. However, these studies lacked sufficient epidemiological information to confirm such an occurrence.

Methods:

We reviewed the surveillance data reported to the National Nosocomial Infections Surveillance (NNIS) System during 1986 to 1993 for K pneumoniae isolates and their susceptibility to either ceftazidime, cefotaxime, ceftriaxone, or aztreonam. Pulsed-field gel electrophoresis (PFGE) was used to study available ESBLR K pneumoniae isolates.

Results:

Among 8,319 K pneumoniae isolates associated with nosocomial infections, 727 (8.7%) were resistant or had intermediate-level resistance to at least one of these antibiotics. One hospital (hospital A) accounted for 321 isolates (44.2%) of ESBLR K pneumoniae. During 1986 to 1993, the percentage of K pneumoniae isolates that were ESBLR increased from 0 to 57.7% in hospital A, from 0 to 35.6% in NNIS hospitals 0 to 20 miles from hospital A (area B), and from 1.6 to 7.3% in NNIS hospitals more than 20 miles from hospital A, including hospitals located throughout the United States. Analysis of PFGE restriction profiles showed a genetic relationship between a cluster of isolates from hospital A and some isolates from one hospital in area B, and consecutive admission in these two hospitals was confirmed for two patients from whom isolates were available.

Conclusions:

These data provide evidence of interhospital transmission of ESBLR K pneumoniae in one region of the United States and stress the interrelationship between hospitals when trying to control antimicrobial resistance.

Type
Original Articles
Copyright
Copyright © The Society for Healthcare Epidemiology of America 1997

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