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Journal of Clinical Microbiology, January 2001, p. 293-297, Vol. 39, No. 1
Department of
Microbiology1 and Neonatal Intensive
Care Unit,2 Academisch Ziekenhuis Vrije
Universiteit Brussel, Brussels, Belgium
Received 28 June 2000/Returned for modification 6 August
2000/Accepted 27 October 2000
We describe an outbreak of necrotizing enterocolitis (NEC) that
occurred in the neonatal intensive care unit of our hospital. A total
of 12 neonates developed NEC in June-July 1998. For two of them, twin
brothers, the NEC turned out to be fatal.
Enterobacter sakazakii, a known contaminant
of powdered milk formula, was isolated from a stomach aspirate, anal
swab, and/or blood sample for 6 of the 12 neonates. A review of feeding
procedures revealed that 10 of the 12 patients were fed orally with the
same brand of powdered milk formula. E. sakazakii was
isolated from the implicated prepared formula milk as well as from
several unopened cans of a single batch. Molecular typing by
arbitrarily primed PCR (AP-PCR) confirmed, although partially, strain
similarity between milk and patient isolates. No further cases of NEC
were observed after the use of the contaminated milk formula was
stopped. With this outbreak we show that intrinsic microbiological
contamination of powdered milk formula can be a possible contributive
factor in the development of NEC, a condition encountered almost
exclusively in formula-fed premature infants. The use of sterilized
liquid milk formula in neonatal care could prevent problems with
intrinsic and extrinsic contamination of powdered milk formula.
0095-1137/01/$04.00+0 DOI: 10.1128/JCM.39.1.293-297.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
Outbreak of Necrotizing Enterocolitis Associated
with Enterobacter sakazakii in Powdered
Milk Formula
*
Corresponding author. Mailing address: Department of
Microbiology, Academisch Ziekenhuis Vrije Universiteit Brussel,
Laarbeeklaan 101, 1090 Brussels, Belgium. Phone: 32-2-4775000. Fax:
32-2-4775015. E-mail: labomicro{at}az.vub.ac.be.
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