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Journal of Clinical Microbiology, 02 1996, 358-363, Vol 34, No. 2
GL French, KP Shannon and N Simmons
An aminoglycoside- and ceftazidime-resistant strain of Klebsiella
pneumoniae K2 producing the extended-spectrum beta-lactamase SHV-5 infected
or colonized 14 pediatric patients at Guy's Hospital. The patients were
mostly neonates recovering from cardiac surgery for congenital defects. The
organism was also isolated from a nurse and from the father of one of the
children. Four patients had septicemia, and two septicemic neonates with
postoperative renal failure died. Aminoglycoside and cephalosporin
resistance transferred to Escherichia coli in vitro on a 160-kb plasmid,
and a similar resistant E. coli strain was isolated from the stools of one
of the affected children. The epidemic organism colonized the bowel and
skin and was probably transmitted via staff hands. Five wards were involved
because of extensive patient movements. The outbreak was controlled by
patient isolation and attention to handwashing. All of the isolates of the
outbreak strain were identical by phage typing, ribotyping, plasmid
profiling, and biochemical and serological testing, but they varied in
their production of SHV-5. Some isolates produced normal amounts of SHV- 5
and were susceptible to beta-lactam-beta-lactamase inhibitor combinations.
Others, including the single isolate of multiresistant E. coli, produced up
to five times as much enzyme as "normal" isolates. This hyperproduction
resulted in increased resistance to several penicillins and cephalosporins
and to the beta-lactam-beta-lactamase inhibitor combinations
amoxicillin-clavulanic acid, ampicillin- sulbactam,
piperacillin-tazobactam, and ceftazidime-clavulanic acid. The
hyperproduction of SHV-5 by K. pneumoniae and E. coli seen in this outbreak
suggests that beta-lactam-beta-lactamase inhibitor combinations may be
unreliable for the treatment of organisms producing extended-spectrum
beta-lactamases.
Copyright © 1996 by the American Society for Microbiology. All rights reserved.
Hospital outbreak of Klebsiella pneumoniae resistant to broad-spectrum cephalosporins and beta-lactam-beta-lactamase inhibitor combinations by hyperproduction of SHV-5 beta-lactamase
Department of Microbiology, UMDS and Guy's and St. Thomas's Hospital Trust, London, United Kingdom.
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