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Journal of Clinical Microbiology, February 1998, p. 552-556, Vol. 36, No. 2
0095-1137/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
Evolution of an Endemic Methicillin-Resistant
Staphylococcus aureus Population in an Australian Hospital
from 1967 to 1996
Rodney
Givney,1,*
Alison
Vickery,2
Anne
Holliday,1
Mary
Pegler,1 and
Richard
Benn2
Department of Infectious Diseases, The
University of Sydney,1 and
Department
of Microbiology, Royal Prince Alfred
Hospital,2 Sydney, Australia
Received 27 June 1997/Returned for modification 3 October
1997/Accepted 14 November 1997
The evolution over 30 years of a population of
methicillin-resistant Staphylococcus aureus (MRSA) from a
tertiary referral hospital was studied by phylogenetic analysis of
SmaI-generated restriction fragment length polymorphisms
(RFLPs). The results suggest that a new clone of MRSA appeared at the
hospital in the early 1980s, which, although usually retaining its
ancestral phage-type, developed four different RFLP pulsotypes in the
next 16 years. This finding indicates that multiple RFLP patterns in
MRSA do not necessarily represent multiple clones deriving from
different mec gene transfer events. Such variation within a
clone may be significant in the interpretation of RFLP patterns during
outbreaks and emphasizes the need to use two typing methods in studies
of such populations. Since the appearance of new clones of MRSA is a
relatively rare event, cross-infection control is paramount in the
prevention of MRSA dissemination.
*
Corresponding author. Mailing address: Communicable
Disease Control Branch, South Australian Health Commission, P.O. Box 6, Rundle Mall, Adelaide, South Australia 5000, Australia. Phone: (08)
8226-7174. Fax: (08) 8226-7187. E-mail:
givney.rod{at}health.sa.gov.au.
Journal of Clinical Microbiology, February 1998, p. 552-556, Vol. 36, No. 2
0095-1137/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
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